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3 years ago

The sum of interior angles of a regular polygon is 1980 degrees. How many sides does the polygon have?

1 answer:

Montano1993 [528]3 years ago

8 0

The formula for interior angle sum is 180(n - 2).
Backtrack it from that.
180(n - 2) = 1980.
1980 / 180 = 11 = n - 2.
11 + 2 = 13 = n.
The polygon has 13 sides.

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