Area Circles Annulus, Sector, Segments

What is the formula for circumference of a circle given the diameter?

• C = π r
• C = 2 π r
• C = π d
• C = 2 π d

If the area of a circle is 25 π cm, then the diameter is?

• 10 cm

• 5 cm

• 25 cm

• pi cm

Which segment is the diameter?

• AC
• BD
• LM
• CE

Which segment is a radius?

• LM
• DC
• BD
• ML

The definition of a circle is

• set of all points in a plain that are the same distance from a point called the center

• the distance around a share

• a large figure

• a pizza, orange, plum, or watermelon

The definition of circumference is

• distance from the center of any point on the circle

• distance from one point to another

• distance around the circle

• distance from the center of any point on the circle

What is the circumference?

• 36

• 115.45

• 108

• 113.04

Find the area of the circle. Leave in terms of π.

• 18π in²

• 9π in²

• 81π in²

If r = 12 cm and R = 18 cm, what is the exact area of the shaded region in terms of ㄫ?

• 280ㄫ sq.cm

• 190ㄫ sq.cm

• 180ㄫ sq.cm

• 80ㄫ sq.cm

A 14 -inch pizza was cut into 8 slices. What is the approximate area of one slice of pizza?

• 9.23 sq. in

• 19.23 sq. in

• 19.32 sq. in

• 20.23 sq. in