Question

prove sum of all angles of triangle is equal to 180 degree​

Answer 1

Answer:

sum of angle of triangle is 180

Step-by-step explanation:

let AB be straight line and parllel to traingle base

then angle 1+2+3=180

angle 1= angle 4 alt intr angle

similarly angle 3= angle 5

sum = 1+2+3 = 4+5+2=180