Angles of Polygons Review

Front

What is the SUM of the angle measures in a nonagon (9 sides)?

Back

1260°

Front

Find the measure of EACH EXTERIOR angle of an 18-gon.

Back

20°

Front

How many sides does a decagon have?

Back

10

Front

What is the formula to calculate the sum of interior angles of a polygon with n sides?

Back

(n - 2) × 180°

Front

What is the measure of each interior angle of a regular polygon with n sides?

Back

(n - 2) × 180° / n

Front

If the sum of the interior angles of a polygon is 1080°, how many sides does it have?

Back

8 sides (octagon)

Front

What is the measure of each exterior angle of a regular polygon with 12 sides?

Back

30°

Front

What is the relationship between the interior and exterior angles of a polygon?

Back

Interior angle + Exterior angle = 180°

Front

How do you find the number of sides of a polygon if you know the measure of each exterior angle?

Back

Number of sides = 360° / measure of each exterior angle

Front

What is the sum of the exterior angles of any polygon?

Back

360°