Proving Similar Triangles Made EASY | Maths GCSE

A quick example of solving a similar shapes question to help with your maths GCSE revision!
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[@revisionboost]

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[@Jasminafernandes777]

Your vids are so help full I'm a year 9

[@revisionboost]

Thanks ! @@Jasminafernandes777

[@ChanhungBui-dw8kq]

pls for thales

[@meserettefera4938]

Wow

[@vanionings]

Yes! then there is that 3rd equal angle in there in the form of vertically opposite angles.

[@ffmasters8784]

AAA doesn't exist Google it

[@RisingwoodsGal]

If 2 angles are equal, the third is automatically equal even if they weren't opposite angles.

[@user-qc9cd5iz3l]

Angle BCA = Angle ECD by Vertically opposite angles
Since AB and ED are parallel and BD is transversal, angle ABC = angle CDE by alternate interior angles

[@mr.fantasyworldtamil6829]

You can also mention vertically opposite angle

[@MrPaulc222]

Good stuff. I would have started with the two angles where the lines intersect, but it doesn't matter which way you go with this, because those two angles by the interesection are the same whether the outer lines are parallel or not.

[@risingstars117]

I have another method
angle BCA = angle ECD ( vertically opposite angles)
AngleC = angleC ( common angle of both the triangles)
When two angles are equal then the third angle is also equal ( angle sum property)
So two triangle are similar by using AAA similarity
Hence proved
How is this method please comment

[@Antisimp3791]

Thanks ihave never been able to understand these, and now I do 😀😀

[@BloxfruitsAnnoyed]

But to prove congruency if triangles, we need one of thr sides to be equal, AAA is no rule

[@godofnumbersakausername5226]

This is so easy:
First, angle b is congruent to d as when a transversal crosses parallel line, alternate interior angles are congruent. angle a also congruent to e for the same reason. Angle acb congruent to dce as vertical angles are congruent. This now fulfills the angle-angle similarity criterion. Solved by 6th grader.

[@alby5059]

[@turkeychickengoose]

Corresponding AA triangle theory

[@tilahuntamiru8936]

Please 😢 how to find the side

[@TangeniSteven-ug7el]

Me trying to use the given values in calculations 😂😂 when the answer is so simple

[@pratiky.m9589]

Thank you for the short and easy explanation shorts
But if in the qn they ask the value of one side( in cm) how to solve that qn can u kindly make a short on this topic also

[@1080GBA]

Bruh this is so easy

[@rorybrowne4973]

Shouldn't they be called alternating angles rather than "Z Angles"?

[@real.3981]

nowadays you dont even need to show the angles you can just say that ab and de are parallel and by the fundamental theorem of similarity theyre similar triangles

[@magicalword1122]

Thanks

[@rayyanmahmoodali123]

What about vertical angle theorem?

[@ven6612]

thank u

[@ghostxriely5746]

Z angle ❌ alternate interior angle ✅

[@shadow_gamer2449]

Thank you sir 😊😊😊

[@poonamchavan6974]

Angle c

[@NiffirgkcaJ]

I've never seen someone write "X" like that. 💀

[@yareofthedaze8963]

The reason we write X like that is to show that it’s not times

[@NiffirgkcaJ]

@@yareofthedaze8963 that's interesting, but it's not in an equation for it to be mistaken as the multiplication sign.

[@alyme_r]

it's how i write the symbol x in maths, showing i mean a variable not a multiplication sign or crossing out of anything

[@yareofthedaze8963]

@@alyme_r yea thanks for explaining it better

[@shaniah9322]

@@NiffirgkcaJCause that’s how you write x as a variable instead of a regular letter

[@Batch-number-755]

AAA postulate

[@Johnweely]

Bro the way he drew the x 😂

[@fatslugtoes]

Thats how you draw it mathematically

[@divine-being]

Easy dey ain

[@user-gv8gx6kv3p]

Soooo
Is CE = 7,2 cm?

[@mlibomatyila2043]

^C is common

[@keanc.factor8321]

What is the name of this triangle?

[@SURUS_EDITZ]

angle BCA= angle DCE

[@ffmasters8784]

AAA doesn't exist Google it and this is not enough information to prove two triangle congruent this video is fake or trash and misleading

[@CeliaWchannel]

Hi! Whats a zed angle?

[@Introvert__.]

When two parallel lines are cut by the transversal (tilted line up there ) then the angles made by them are equal..
Btw they are called corresponding angles.

[@Guavasaur3]

learn alternating and vertically opposite angles too because i learned all 3 of them together but might be different for others

[@CeliaWchannel]

Thanks. 👍

[@scythiclearning.6373]

Imagine you needed to prove it congeruent🤣
AAA rule 😂😅

[@Anti_Racist696]

You can't prove congruency as sides aren't equal

[@lathusan10]

u can't prove congruency as the sides are not equal

[@stumpanimations2431]

They have 3 sides.

[@ayandamthethwa4898]

I hate math it is so hard , i just failed the very same sum yoh😢😢😢😢

[@shantelnyaumwe2006]

Both have 3 sides😢

[@anjanatyagi1349]

Yaa but in similarity we cna also use 2 side AA is a criteria

[@ffmasters8784]

AAA doesn't exist Google it and this is not enough information to prove two triangle congruent this video is fake or trash and misleading

[@ffmasters8784]

​@@anjanatyagi1349it's not

[@anjanatyagi1349]

@@ffmasters8784 yes it isss

[@sonikumari3313]

​@@anjanatyagi1349are congruence and similarity different or similarity ke 2angel or 2 side ki hi jaurat hoti hai

[@nihalc5562]

trash

[@SubIfYouFounMyComment]

So they’re simillar and not congruent right?

[@revisionboost]

Yep, that's right!