You could use a shadow length of a known object like a ruler or yardstick. Then, find the ratio of the known info and compared the shadow length of the flower.
Mathematics is timeless. Believe it or not I learned how to multiply fractions in the 1960s. I'm a grandmother. They still teach the same basic way. Algebra doesn't change. Geometry doesn't change. I'm so glad I could help you!
this video helped me a lot and made it easier for me to calculate the measurements. Thank you A lot :) glad that this video was posted, it still relates from then and now. Thank you :)
Try watching this short playlist and you'll be a pro at it. :-) Grade 8 Math, Chapter 12, Pythagorean Theorem Playlist ua-cam.com/play/PLKi4WTp6PRGWAOm9mgM05yKrUreEcd0gg.html
Best of luck! You can also scroll these playlists for topics of your test. :-) Algebra I Course Playlist: ua-cam.com/play/PLKi4WTp6PRGXzkjUUMYVChM2WxWfgIrK4.html Algebra 2 Playlist Chapter 1 thru 15 ua-cam.com/play/PLKi4WTp6PRGVGCVa4jrZLB7zFNG3mRg0N.html
I tried to do this in a different way and got the same answer. I used a calculator though I just figured out that 18 is 60% of 30. So I did 56×60% which is equal to 33.6. somehow I feel like this is more common sense. The way you did it feels like more steps to remember.
ButterIsMyLife , I don't have that particular book but I am on Facebook as JoAnn's School and you can take a picture of the problem and send it to me through the messaging system. I'll see what I can do. Otherwise if there's any way that you can type the problem into this comment I'll try to solve it but I think taking a picture would be easier if you can.
Hmmm, I should have clarified that the five dots were the "given" information. Sorry about the confusion. It told us that c = f, b = e, h and side df (the 18 ft)correspond, a = d, bc as 55 ft and ef as 30 ft correspond. Watch these and it should make your life easier: Grade 8 Math #11.3a, Discovering Angle-Angle (AA) similarity ua-cam.com/video/BbT_TYS8rFA/v-deo.html Grade 8 Math #11.3b, Using the Angle-Angle (AA) Similarity Postulate ua-cam.com/video/iVca2aznoR8/v-deo.html Grade 8 Math #11.3c, Finding missing measures in Similar Triangles ua-cam.com/video/eJDJXHZZN6I/v-deo.html High School Geometry 8.1, Similarity in Right Triangles ua-cam.com/video/hz1RePt7kGE/v-deo.html
Isn't it possible to calculate the height of a tall tree in isolation, without doing a comparison with something else? If you know the length of its shadow, you know the angle of the shadow on flat ground, and you know the tree stands perpendicular to the flat ground, then with pencil, paper, ruler, and protractor draw the triangle. If the shadow length is, say, 40 feet, then on paper draw a length of 40 centimeters. Then see how many centimeters the height of the triangle is and convert to feet.
Shove a stick, fence pole, something into the ground near it. Measure the height and length of the stick and its shadow. Then use those lengths to find the height of the tree. Just comparing the shadow length to the tree won't give you the trees height because you wont know the proportion or ratio to use. By using a stick near it, you can compare the sticks shadow to the trees shadow to know the proportional difference.
I'm a grandma. I'm old. That's called an "age spot". I have many. Age spots are a result of the body producing excess melanin, more likely to those over 40. Melanin is the pigment that gives skin its color. Since making this lesson, my hand has 2 more. (sigh) Growing older isn't fun after a certain age. :-(
Sorry about the previous comment, I deleted it. I thought you said the sides. All triangles have 180 degrees inside. If one angle is a right angle of 90 degrees, and the length of the line segments that make the 90 degree angle have the same length, then the other two angles must be equal to each other. If one of the side lengths, or legs, is longer than the other then the angles will be different from each other because the longer leg will make a smaller angle where it meets the hypotenuse. I hope that makes sense! Let me know!
I just had a test with this question, I did it a different way, I saw the larger triangle as a dialation of the smaller triangle, so I took the scale factor between the shadow length s and applied it to the heights, I had easier numbers to work with, did I get it right?
You're welcome! And just in case you need them, my channel has playlists of grade 1 through grade 8, Algebra 1, Algebra 2, and high school Geometry. Each playlist has over a hundred lessons for the entire school year, in order. :-)
Oh okay. There are two triangles made, one from the chimney and its shadow and another from the gate and its shadow. We're comparing the two triangles. They're in proportion to each other. Can you message me on Facebook so I can send you a drawing of this? facebook.com/JoAnnsSchool/
Angle e and angle b are angles with the same degree measure. Watch this video starting at 2:39: Degrees of an Angle, Circle ua-cam.com/video/ws37b-7UrJk/v-deo.html
If a skyscraper casts a shadow And directly UNder the skyscraper farm Princess has a laundry line. Arent EACH EQUIVALENT to each other? Then why not use each as counterweights.
Dorothy Robertson, I chose 55 ft as the shadow length of the taller tree so the height of the taller tree would equal a whole number. If the shadow was 56 ft, then our proportion would be h/18' = 56/30. Then we'd have 18 (56) = 1,008. Then h = 1,008 divided by 30 = 33 3/5 ft. I made the shadow 55ft so we wouldn't have to deal with that fractional measure.
G.E.D. Math 6f, Solving Proportions (cross cancelling)
ua-cam.com/video/T9EacEHGJUA/v-deo.html
Grade 6 Math #5.3, Proportions - proportional fractions
ua-cam.com/video/AbngXD7j9cg/v-deo.html
Grade 6 Math 5.4A, Solve Proportions by Equivalent Ratios (New Version)
ua-cam.com/video/lwrAIyES4GA/v-deo.html
You could use a shadow length of a known object like a ruler or yardstick. Then, find the ratio of the known info and compared the shadow length of the flower.
Thank you it really helped me thanks ( I cant belive I am seeing this in 2020 and made in 2015)
Mathematics is timeless. Believe it or not I learned how to multiply fractions in the 1960s. I'm a grandmother. They still teach the same basic way. Algebra doesn't change. Geometry doesn't change. I'm so glad I could help you!
Me rn😭
I’m watching in 2021 because I have a test with this question
2024
this video helped me a lot and made it easier for me to calculate the measurements. Thank you A lot :) glad that this video was posted, it still relates from then and now. Thank you :)
thank u i didn't play attention in class today and this 3 minute video saved me from failing my test
Thank you so much!! I've been having all sorts of problems with these questions and now it makes so much sense xx
4year old video just saved me from my test thank you so much
Math is timeless. Glad it helped! :-)
I'm on here for the asvab because I found this 2 times but the second time I was close and stop I didn't do it thnx so much
Try watching this short playlist and you'll be a pro at it. :-) Grade 8 Math, Chapter 12, Pythagorean Theorem Playlist
ua-cam.com/play/PLKi4WTp6PRGWAOm9mgM05yKrUreEcd0gg.html
this was legit so freaking good what the heck
This just helped me in my similar figures and triangles assignment. Thank you so much 😊
You're very welcome!
yo its that easy? tysm for this video now i can make my math assignments:)
studying for an algebra test this is helping me a lot thanks.
Best of luck! You can also scroll these playlists for topics of your test. :-)
Algebra I Course Playlist:
ua-cam.com/play/PLKi4WTp6PRGXzkjUUMYVChM2WxWfgIrK4.html
Algebra 2 Playlist Chapter 1 thru 15
ua-cam.com/play/PLKi4WTp6PRGVGCVa4jrZLB7zFNG3mRg0N.html
Thank you Very much mam. You have given me alot of trignomatry. I strongly respect you as Indian चेला।
thanks this helped me on my homework lol
I got a shadow problem correct on my midterm exam because of your video. Thank you so much.
Glad it helped! :-)
Thank you so much!! This video helped me understand a lot more!
Nice video very helpful for me
Thanks dear!💖
simplify. 18 0ver 30 = x over 56. no need for the extra steps in trig.
Wonderful video!Thank you so much
I tried to do this in a different way and got the same answer. I used a calculator though I just figured out that 18 is 60% of 30. So I did 56×60% which is equal to 33.6. somehow I feel like this is more common sense. The way you did it feels like more steps to remember.
It's just the Pythagorean theorem , a² + b² = c².
Thank you! it helped me to understand how it works.
Could you explain how to do one of the problems on page 389 in the discovering geometry book? Im just not quite sure on how to calculate them
Or anything similar to that it would be a great help because you teach so well
ButterIsMyLife , I don't have that particular book but I am on Facebook as JoAnn's School and you can take a picture of the problem and send it to me through the messaging system. I'll see what I can do.
Otherwise if there's any way that you can type the problem into this comment I'll try to solve it but I think taking a picture would be easier if you can.
Could you please explain why angle B=angle e ???
Hmmm, I should have clarified that the five dots were the "given" information. Sorry about the confusion. It told us that c = f, b = e, h and side df (the 18 ft)correspond, a = d, bc as 55 ft and ef as 30 ft correspond. Watch these and it should make your life easier:
Grade 8 Math #11.3a, Discovering Angle-Angle (AA) similarity
ua-cam.com/video/BbT_TYS8rFA/v-deo.html
Grade 8 Math #11.3b, Using the Angle-Angle (AA) Similarity Postulate
ua-cam.com/video/iVca2aznoR8/v-deo.html
Grade 8 Math #11.3c, Finding missing measures in Similar Triangles
ua-cam.com/video/eJDJXHZZN6I/v-deo.html
High School Geometry 8.1, Similarity in Right Triangles
ua-cam.com/video/hz1RePt7kGE/v-deo.html
It was really useful, thanks!
Isn't it possible to calculate the height of a tall tree in isolation, without doing a comparison with something else? If you know the length of its shadow, you know the angle of the shadow on flat ground, and you know the tree stands perpendicular to the flat ground, then with pencil, paper, ruler, and protractor draw the triangle. If the shadow length is, say, 40 feet, then on paper draw a length of 40 centimeters. Then see how many centimeters the height of the triangle is and convert to feet.
Shove a stick, fence pole, something into the ground near it. Measure the height and length of the stick and its shadow. Then use those lengths to find the height of the tree. Just comparing the shadow length to the tree won't give you the trees height because you wont know the proportion or ratio to use. By using a stick near it, you can compare the sticks shadow to the trees shadow to know the proportional difference.
1:59 i know I am supposed to be paying attention to the problem but what is that mark on her hand
I'm a grandma. I'm old. That's called an "age spot". I have many. Age spots are a result of the body producing excess melanin, more likely to those over 40. Melanin is the pigment that gives skin its color. Since making this lesson, my hand has 2 more. (sigh) Growing older isn't fun after a certain age. :-(
Than you so much
So kind of you 🌹🌹🌹
amaaaaaaaaaazing
thanks
Thanks
i have my final math exam tomorrow, thanks so much
Best of luck!
Thank you
How do you know that the other two angles of the triangles are equal? I understand that the angle from the tree to the ground is 90 degrees.
Sorry about the previous comment, I deleted it. I thought you said the sides. All triangles have 180 degrees inside. If one angle is a right angle of 90 degrees, and the length of the line segments that make the 90 degree angle have the same length, then the other two angles must be equal to each other. If one of the side lengths, or legs, is longer than the other then the angles will be different from each other because the longer leg will make a smaller angle where it meets the hypotenuse. I hope that makes sense! Let me know!
i like your videos they help me study :)
I just had a test with this question, I did it a different way, I saw the larger triangle as a dialation of the smaller triangle, so I took the scale factor between the shadow length s and applied it to the heights, I had easier numbers to work with, did I get it right?
A scale factor is a ratio. So, yes, if done correctly.
😊 thank you
Im in Philippines and we have homestudy because of COVID 19 this help me thanks
You're welcome! And just in case you need them, my channel has playlists of grade 1 through grade 8, Algebra 1, Algebra 2, and high school Geometry. Each playlist has over a hundred lessons for the entire school year, in order. :-)
What if the shadows of different tree have different term? Like 45m and 12ft?
Should i use the same formula that you use?
Oh okay. There are two triangles made, one from the chimney and its shadow and another from the gate and its shadow. We're comparing the two triangles. They're in proportion to each other. Can you message me on Facebook so I can send you a drawing of this? facebook.com/JoAnnsSchool/
Oh sure. Actually this is for my nephew's work. I need to teach her because she don't understand it too.
@@JoAnnsSchool message sent
Wat of d shadow of a translucent material.
A shadow is a shadow.
Cause my teacher said shadows are casted perpendicular to the object
Perpendicular means "making a 90° angle, or a right angle", just like the tree is making a right angle with the ground. :-)
@@JoAnnsSchool pls can I send a question to you
Anyone can message me on my JoAnn's School Facebook page at facebook.com/JoAnnsSchool/
Why are e and b equale?
Angle e and angle b are angles with the same degree measure. Watch this video starting at 2:39: Degrees of an Angle, Circle
ua-cam.com/video/ws37b-7UrJk/v-deo.html
Ooow thank you😀
It's cause of the sun is making the shadows the same anquele
Sorry for bad English
If a skyscraper casts a shadow
And directly UNder the skyscraper farm Princess has a laundry line. Arent EACH EQUIVALENT
to each other? Then why not use each as counterweights.
Um how does 56 get turned into 55???
Nice
The shadow knows.
Its trigonometry
instead of GPS, should've used the shadow of the helicopter to pinpoint target.
Thk
Why 55?
Should that be 56?
Dorothy Robertson, I chose 55 ft as the shadow length of the taller tree so the height of the taller tree would equal a whole number. If the shadow was 56 ft, then our proportion would be h/18' = 56/30. Then we'd have 18 (56) = 1,008. Then h = 1,008 divided by 30 = 33 3/5 ft.
I made the shadow 55ft so we wouldn't have to deal with that fractional measure.
???