Equal angles opposite to equal sides in a triangle (Theorem and Proof)

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Friends,

This is a Math video. This is our sixth webisode (WB-6) on "Series 7 -- Triangles".
In this video, we learn that if we draw an isosceles triangle i.e. a triangle that has two of its three sides equal, then the angles opposite to those two equal sides are also equal. We then go ahead and prove this theorem.

This video is suited for class-9 (Class-IX) or grade-9 kids.

Cheers,
Friends at Rising Pearl

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What is the area of an isosceles triangle without using trigonometry or integration whose equal sides are 20 cm and the angle between them 30 deg?

souravdaw

Hi Nikhil,
Thank you, glad you find this video (and others) helpful.
Cheers,

dostotussigreatho

waav! My son wateched this and got his doubt cleared immediately. Thanks to dostotussigreatho. Doing great job. Cheers

tnagaraja

Can we construct perpendicular bisector in it

suprabhatupadhyay

Thnk u it hlped me a lot !!! Keep it up !!! Plz keep posting more videos like this

sushreesahu

Take a sip of your drink everytime he says dosto

devsharma

I have a question for u sir which I cannot prove
AD, BE and CF, the altitudes.of triangle ABC are equal. Prove that triangle ABC is an equilateral triangle .
Pls answer . U teach very well.
Thank you

vaishnavirajeev

This was a very helpful video, but I'm doubtful about one thing.
In the case of 2 similar triangles, if two of their sides are proportional, does it also mean that the angles opposite them are equal to each other?
I would be grateful if you could answer this.
Thankyou :)

shilparajivnair

Can we use R.H.S congruence condition?

ayushkumarpandey

Keep It U The Good Work :D
Helped Me Alot

nixxgill

This Helps me understand a lot Yippee!

melanie

Can we also proove this by AAS RULE
If we take...
1) /_ ABD = /_ACD angle opp equal side of triangle are =
2) AD = AD as common side
3) AB = AC given

archanabele

Me from Bangladesh
This vedio is helpful thanks

hamedshah

Thanks to help me in this type of questions

sudhasingh

are u english or hindi sir it was really helpful

TheVarshi

Sir we can prove it by ASS through
Angle BAD =DAC
ADB=ADC
AB=AC

veeresh.legendx

If some american is here and dont know the meaning of dosto so dosto means friend

fullchidori

Your language is not good please try to understand your language to better

KingKhan-bgek

Mst English speaking 🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣🤣 half English half hindi

kinggamingyt

Speak into hindi and english in both language

shubhampal

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