5.1 Concept Check

Name three quadrilaterals.

• circle, square , triangle

• rectangle, square, rhombus

• hexagon, rectangle, pentagon

• triangle, quadrilateral, pentagon

What is the sum of the interior angles of a pentagon?

• 180°

• 360°

• 540°

• 108°

What is the sum of the interior angles of a decagon (10 sided)?

• 960°

• 1440°

• 1800°

• 144°

What is a regular polygon?

• A regular polygon is a polygon that has all angles equal but sides can be different.

• A regular polygon is a polygon that has all sides and angles unequal.

• A regular polygon is a polygon that has all sides equal but angles can be different.

• A regular polygon is a polygon that has all sides and angles equal.

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

• 120°

• 135°

• 1440°

• 108°

What is the formula to calculate the interior angle of a regular polygon?

• (n-2) * 180 / n

• n * 180

• n * (n-2) * 180

• (n-2) * 180

What is the angle measure of each interior angle in 14 sided regular polygon?

• 2160°

• 154.3°

• 180°

• 142.7°

Which of the following is a regular polygon?

• Triangle

• Rhombus

• Square

• Pentagon