Review of Lessons 7.1-7.3 GEOMETRY

To find the sum of interior angles of a regular polygon, the rule is:

• (number of sides - 2 ) times 180

• (number of sides ) times 180

The sum of the interior angles of an octagon is

• 1440°

• 1080°

To find the measure of one interior angle of a regular polygon, the rule is:

• (number of sides ) times 180

• the sum of the interior angles divided by (number of sides )

Find the measure of each interior angle of a regular octagon:

• 180°

• 135°

Find the measure of each interior angle of a regular 45-gon:

• 172°

• 8100°

• 8°

The sum of the exterior angles of any polygon with

n-sides (any number of sides) is:

• 180

• 360

• 180n

• 360n

To find one exterior angles of a regular polygon, the rule is

• Divide the number of sides by 180: n/180

• Divide the number of sides by 360: n/360

• Divide 360 by the number of sides: 360/n

Find the measure of each exterior angle of a regular 45-gon:

• 7740°

• 8100°

• 8°

The opposite angles of a parallelogram are ...

• complementary

• congruent

• supplementary

• perpendicular

Find the measure of angle F.

• 105

• 35

• 120

• 110