Question

Given the diagram below, what is mA?

Answer 1

Answer: 70

Explanation:

Answer 2

For a polygon of n sides, the sum of the measures of the interior angles is 180(n - 2).

This polygon has 4 sides, so the sum of the measures of the interior angles is

180 * (4 - 2) = 180 * 2 = 360

m<A + 110 + 110 + 70 = 360

m<A + 290 = 360

m<A = 70