Question

Find the value of x in the triangle

Answer 1

72⁰

Explanation:

By angle sum property:

x + 77 + 31 = 180

x = 180 - 108

x = 72⁰

Answer 2

x =72

Explanation:

The sum of the angles of a triangle is 180 degrees

x+77+31 = 180

Combine like terms

x + 108 = 180

Subtract 108 from each side

x+108-108 = 180-108

x =72