Question

Each interior angle of a regular nonagon has a measure 13x+10°. What is x?

Answer 1

Explanation:

A nonagon has nine sides.

The sum of exterior angles = 360°, so each exterior angle is 360°/9 = 40°.

Each interior angle = 180°-exterior angle = 140°.

13x + 10° = 140°

x = 10°