SAT Math Multiple Choice Practice Question 232: Answer and Explanation
The figure above shows a polygon with five sides. What is the average (arithmetic mean) of the measures, in degrees, of the five angles shown?
Correct Answer: B
B Any five-sided polygon can be divided into three triangles like so:
Since the sum of the angles in a triangle is 180°, the sum of the angles in this figure is . The average measure of the five angles, then, is .