Question

20. Prove that Angles of a Triangle is 180°?​

Answer 1

To prove the above property of triangles, draw a line \overleftrightarrow {PQ} parallel to the side BC of the given triangle. Thus, the sum of the interior angles of a triangle is 180°

Answer 2

Answer...

To prove the property of triangle ,draw a line (pq)

parallel to the side BC of given triangle,

thus the sum of interiour triangle is 180