Question

A student finds the sum of the angle measures in an octagon by multiplying 7 • 180°. What is the student's error?​

Answer 1

The student should compute 6*180 = 1080 because of the formula

S = 180(n-2)

We have n = 8 sides which leads the n-2 part to become n-2 = 8-2 = 6