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Prove that the sum of all angles of triangle is 180

Posted by Lusifer Mahakalbhakt 8 years, 7 months ago

CBSE > Class 09 > Mathematics

2 answers

Ujjwal Dubey 8 years, 7 months ago

Draw a line | | to its base through its opposite vertex , Now by alternate interior angle , show the base angle = the angle formed on the | | line , and one angle become common , so by linear pair sum of those angle become 180° . since base angle were equal to the angle of | | side . And it show that sum of all angle of a triangle = 180°

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Karishma Kumawat 8 years, 7 months ago

Sum of all the angles = 180 because x+2x = 180 so 180/2 =90

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CBSE > Class 09 > Mathematics