Question

proof that the sum of a triangle is 180

Answer 1

hope it is ryt n helpful to you

Answer 2

given ABC is a triangle
Required to proof:- A+B+C=180
proof;:-
$l || bc \: \: and \: ab \: is \: the \: transversal \ \angle1 = angleb{alterte \: interior angel} \\ angle2 = anglec{alternte \: interior \:angle \: } \\ therefore \: angle \: a = angle \: a{reflctive \: property} \: add \: 1 \: 2 \: 3 \: we \: get \\ angle1 + \: angle2 + angle \: a = angle \: b + angle \: c + angle \: a \\ but \: angle1 + angle2 + angle \: a = 180{linear \: pair \: angle} \\ therefore \: angle \: a + angel \: b + ange \: c = 180$