The sum of the measures of 7 interior angles of an 8-sided polygon is 1,000°. What is the measure of the 8th exterior angle?
Show answer & explanation
Correct answer: C
Explanation
100°
Sum of interior angles of an 8-sided polygon = (8−2) × 180° = 1080°
8th interior angle = 1080° − 1000° = 80°
8th exterior angle = 180° − 80° = 100°