Question

the sum of all angles of triangle is​

Answer 1

Answer:

Sum of all angles of a triangle are 180 degrees

PLEASE MARK BRAINLIEST

Answer 2

Answer:

180º

Step-by-step explanation:

In the figure, ∆XYZ is a triangle with angles marked x= 1, y= 2, z= 3 respectively.

Now, construct a line "n" such that n || YZ.

.: 1 = 5              (Alternate interior

 2 = 4               angles)

 3 = 3              (common angle)

.: 3 + 4 + 5 = 180 (sum of angles on a straight line)

=> 1 + 2 + 3 = 180 (from above deduced results)

=> X + Y + Z = 180

HENCE, PROVED