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How to prove the angle sum …

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How to prove the angle sum property of a triangle??

Posted by Samiksha Joshi 5 years, 2 months ago

CBSE > Class 09 > Mathematics

2 answers

Mr Mady 5 years, 2 months ago

Take a line parallel to the base . Angle 1 on top angle 2 on either right or left and third one on the third space.The sides (other than base) form transversal on two parallel lines. 1+4+5=180° on the line parallel to base 2=4 and 3=5 both alternate interior angles .So 1+4+5=180° then 1+2+3=180°(proved)

0Thank You

Firoj Khan 5 years, 2 months ago

A+b+c=180

0Thank You

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CBSE > Class 09 > Mathematics