alleryThe interior angles of a simple polygon add up to 1080 degrees. How many sides does it have?
A6
B7
C8
D9
Answer & Solution
Correct answer: C. 8
1. Set (n - 2) x 180 = 1080.
2. Then n - 2 = 6, so n = 8.
3. Check: 6 sides give 720, 7 give 900 and 9 give 1260, so none of those fit.
_Source: Wikipedia, Polygon, section Angles_
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