- A12
- B10
- C11
- D22
Step-by-Step Solution
Interior sum = (n - 2)180, exterior sum = 360. So (n - 2)180 + 360 = 1980, (n - 2)180 = 1620, n - 2 = 9, n = 11.
Answer: C) 11
A regular polygon is such that the sum of its interior angles plus the sum of its exterior angles equals 1980°.
How many sides does it have?
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