Class 9 Maths | Chapter 12 | Exercise 12.1 Q1 | Heron's Formula | NCERT
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- Опубліковано 29 лип 2021
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In this session we will be continuing with the chapter "Lines and Angles".
We will cover Exercise 12.1 Q1 of chapter 12.
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There is one more easy method to slove this question...🙂🙂
Perimeter of triangle=180
3×a = 180
3a= 180
a=180/3
a=60cm
Semi perimeter= Perimeter/2
=180/2 = 90cm
S=90cm
Heron's formula:
=√90(90-60) (90-60) (90-60)cm²
=√90×30×30×30cm²
=√3×30×30×30×cm³
=30×30√3cm²
=900√3cm²
(BY THE WAY, TOMORROW IS MY MATHS PAPER... SO WISH ME ALL THE BEST)🎉🙃🙃
May you fail in exam . Bless you❤🤣
@Total gaming. thank you😊
@@Ham_za27 You too☺️
@Total gaming. 👍
I was also thinking that we can get semi perimeter of 180 then I think this must be a new logic of maths 😅😂
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@@aeris_09 BRO, JO 10TH CLASS MAIN PADTE HAIN UNKE 2023 MAIN FINAL EXAM NAHI HONGE KYA?
Yes
Is this right...?
Perimeter of triangle =180 cm
3a = 180 cm
a =180/3
a = 60
Semi perimeter=180/2 which is 90 cm
Now, using Herons formula
√S(s-a)(s-b)(s-c)
√90(90-60)(90-60)(90-60)
√90×30×30×30
Now,
90 = 2 x 3 x 3 x 5
30 = 2 x 3 x 5
30 = 2 x 3 x 5
30 = 2 x 3 x 5
2×2×3×3×5×5√3
4×9×25√3
900√3
Whoever checked, thank you very much. 😊😊
Will you be my maths teacher?😅❤
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Mene bhi aise he Kiya tha lekin fir pata chala ki jo 180 perimeter Diya hai woh usi mein se he dusra q pucha hai😢
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Yes 🤣
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By mistake
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this is difficult method mam u can use easy method u can first find all it's sides and find semi perimetere by diding 180 by 2 = 90 after put this value in herons formula in the place of S you put 90 in place A you can put 60 and after calucation you get 90(30 (30)(30) now you can make 90 has 3× 30.. now make group of both 30 = 30 ×30 √ 3 ...= 900 √ 3 is the answer
You are correct
yes correct
I was about to say this but there's a problem in this case , as the question says we have to find by two methods once, when there is no perimeter given and other when there is perimeter given. The way you told was only one part where the perimeter is given, you have to show the other part too where perimeter is not given the question is divided into two parts see clearly
yes you are correct but this is easy method
Hmm right
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really wow nice I got too low marks 😞😭
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@@mobacoin i also
Only in maths i gets lessss
@@og-teswaraj4866 oh
Ma'am can we do it directly 180/3
Because it is an equilateral triangle
Ya ma'am same question
And for finding the semiperimeter can we simply divide 180/2
Yes I have the same question too
As when I did it by myself I got the ans 900 underroot 3 but when u recheck it was wrong
bruh this teacher took all of the time and later told us that
Mcq based question plzzzzzzzz for all 9th students
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Mam instead of writing 3a/2 We can directly write the perimeter which is 180
Ma'am we should simply take
Perimeter =a+a+a
180=3a
a=180/3
a=60
And then put in the formula of area
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Actually i think a is very easy to find because area of triangle 180
As it is given that it is a equilateral triangle so a60 b60 c60
ua-cam.com/users/shortsbUmOF6oxWes?si=poosTLgdLlijCTDS
I also think that
Another simple way is:
sum of triangle =180
s=a+a+a(s is given which is 180)
180=3a
180/3=a
60=a
now ;under root3/4(a)²=3/4(60)²
=under root 3/4×3600
3cm²,900
Mam please MCQs for term 1
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Formula or equilateral traingle
= √3 / 4 a²
= √3 / 4 * 60 * 60
= √3 * 30 * 30
= √3 * 900
= 900√3
Mam if agar ye sahi hai to pin kijiyega please 🙏🙏
Ma'am please explain examples also
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Thankyou mam for you teaching and I always appreciate you for making us a brilliant student by your videos once again thanking you
1:42 Mam s is semi perimeter not semi circle 😶
BTW easy explanation mam
THANKS 😊
Ma'am you can do it easily by getting the sides of triangle.The perimeter is also given there and there are 3 side.You can divide 180 by 3 and you will get the 3 side equal to 60.Then you can solve it easily.
Yes , we can do it easily in this method
Hmm
Yes that's wht i was thinking..
Y don't u open the UA-cam channel if u know that much
@@AslamKhan-kr3wk I am just suggesting a method.I am not a teacher,just a student.And why your a** is burning if I'm telling a method
A perfect line in ques no.1 in formula 👌
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Mam please make a video of chapter-7 Triangles mam please 🥺🙏
Ha video
ua-cam.com/play/PLPFrvtzFBmvwNQs5S0K2RV_JNuKuJi1Zb.html
Ye rhi link ok chapter 7 manshi mam ka
To make this question easy we can also find out the side , first , then semi perimeter and then its area . This method is easy then the mam's method.
There are two method solving this question if we practise the method told by u then answer will be correct and if we did the maam's method the answer would be still correct
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One day before exam i always watch your explanation 🙃mam u teach in very easy methods
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Easy method 👇
Perimeter=180
a+a+a=180
3a=180
a=180/3
a=60
S=perimeter/2
= 180/2
S=90°
Area of triangle= √s(s-a)(s-b)(s-c)
ha bhai easy easy method🖤
Very easy method 😀😀
Thanks bro
But the answer will be wrong
@@shouryasah323 no my answer is right using this easy method
Such a great explanation
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no
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Thankyou ma'am mere ko bilkul bhi heron formula nyi samjh aa rh th but aapne isko ache se explain kr diya you are the best 😊😊
can we write 3a/2 as180/2 and if not so why not.
That's what I was thinking I have done this only at first but my answer was wrong I don't know why
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