Quadrilaterals & Angles of Polygons

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What is the sum of the measures of the interior angles of a 19-gon?

S = (19 - 2) * 180 = 3060°

If the sum of the measures of a polygon is 1800°, how many sides does it have?

1800=(n-2)*180 ... n = 12

What is the measure of each interior angle of a regular decagon?

((10-2)*180)/10 = 144°

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