alleryA simple polygon has an interior angle sum of 1440 degrees. How many sides does it have?
A8
B9
C10
D12
Answer & Solution
Correct answer: C. 10
1. Set (n - 2) x 180 = 1440.
2. Then n - 2 = 8, so n = 10.
3. Eight sides give 1080, nine give 1260 and twelve give 1800, so they fail.
_Source: Wikipedia, Polygon, section Angles_
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