9514 1404 393
Answer:
Step-by-step explanation:
The sum of measures of exterior angles is 360°, so the number of sides (n) can be found from ...
18° × n = 360°
n = 360/18 = 20
The polygon has 20 sides.
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The sum of measures of interior angles will be ...
20(180° -18°) = 3240° . . . . sum of interior angles
