alleryA polygon with n sides has angle sum (n - 2) x 180 degrees. What is the sum for an octagon?
A1440
B900
C1260
D1080
Answer & Solution
Correct answer: D. 1080
1. An octagon has n = 8 sides.
2. Angle sum = (8 - 2) x 180.
3. 6 x 180 = 1080 degrees.
4. The value 900 comes from using n = 7 and 1260 from n = 9.
_Source: Wikipedia, Quadrilateral (CC BY-SA 4.0), Quadrilateral_
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