Engineering Board Exam Reviewer · Polygons · easy

Find the sum of the interior angles of a 12-sided polygon (dodecagon).

1. 1800°
2. 2160°
3. 1440°
4. 2000°

Answer

A. 1800°

Solution

(n-2)(180°)=(10)(180°)=1800°.

More Polygons questions

1. Find the measure of each interior angle of a regular nonagon (9 sides).
2. How many sides does a regular polygon have if each exterior angle measures 24°?
3. Find the number of diagonals in a regular polygon with 15 sides.
4. The sum of the interior angles of a polygon is 1980°. How many sides does it have?
5. Find the area of a regular hexagon with side length 8 cm.
6. A regular polygon has an interior angle of 165°. Find the number of sides.

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