Question

Defind angle
Sum Property of
Triangle
​

Answer 1

Step-by-step explanation:

In this ∆ ;

by angles sum property-:

x + 60° + 40° = 180°

x + 100° = 180°

x = 80°

Answer 2

Answer:

According to the Triangle Angle Sum Theorem, the sum of the three interior angles in a triangle is always 180°.

so, here 60+ 40+ x =180

100+x = 180

x = 180 - 100

x = 80