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Prove the sum of angles of …

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Prove the sum of angles of a traingle is 180

Posted by Neha Nayyer 6 years, 5 months ago

CBSE > Class 09 > Mathematics

4 answers

Sia ? 6 years, 5 months ago

Let the triangle's of angle is x, y and z
we have to prove
x + y + z = 180 ..........(i)
we know that sum of two interior opposite angle is equal to exterior angle.
so, x + y = 180 - z ....... (ii)
By linear pair exterior angle is 180 - z when triangle's angle is z.
By (i) also we get
x + y = 180 - z ..........(iii)
Hence proved
(ii) and (iii) are the same, so we can say that the sum of the three angles triangle is 180^o.

Vansh Gupta 6 years, 5 months ago

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Aditya Raj 6 years, 5 months ago

Rs aggrawal ka page no 241 theorem no 1dekhna solve ho jayega

Neha Nayyer 6 years, 5 months ago

I don't know

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