Question

The sum of all but one interior angle of a heptagon is 776°. What is the measure of the final interior angle? 42º 56º 124º 304º.

Answer 1

C. 124

Explanation:

E2020

Answer 2

124°

Explanation:

the sum of the interior angles of a polygon is

sum = 180° (n - 2) ← n is the number of sides

here n = 7 ( heptagon has 7 sides ) , then

sum = 180° × 5 = 900°

let x be the final interior angle , then

776° + x = 900° ( subtract 776° from both sides )

x = 124°