Question

Prove that all angles of triangles add=180

Answer 1

Step-by-step explanation:

________a________

1 /2\3

/. \

b /___\c

angles(1+2+3) =180 straight line

angle 1 = angle abc (alternate interior angle)

similarly angle 3=angle acb ( alternate interior angle)

angle bac = angle 2

therefore, angles ( 1+2+3)= angles (a+b+c)= 180

hence proved