Circles

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

Tags

CCSS.7.G.B.4

The _____ is the distance from the center to any point on the circle.

• diameter

• radius

• π

• center

The distance across a circle through its center is called the _____.

• diameter

• radius

• π

• center

Tags

CCSS.HSG.C.A.2

A _____ is half of a circle.

• circumference
• pi
• semicircle
•  composite figure

Tags

CCSS.HSG.C.A.2

If you are given the diameter, how can you calculate the radius?

• Multiply the diameter by 2
• Divide the diameter by 2
• Add 2 to the diameter
• Subtract 2 from the diameter

Tags

CCSS.7.G.B.4

Which segment is the diameter?

• AC
• BD
• LM
• CE

Tags

CCSS.HSG.C.A.2

Name a tangent.

• Segment XC
• Segment LM
• Segment HJ
• LINE BD

Tags

CCSS.HSG.C.A.2

CCSS.HSG.C.A.4

Find the area of the circle if the diameter is 18 inches.

• 56.52

• 254.34

• 1017.36

• 113.04

Tags

CCSS.7.G.B.4

What is the area of this circle if the radius is 5 cm?

• 82.13

• 78.5

• 314.16

• 170.12

Tags

CCSS.7.G.B.4

Find the area of the shaded sector of circle O.  The radius is 6 inches and the central angle is 100°.  Express answer to the nearest tenth of a square inch.

• 9.2 sq. in.
• 10.5 sq. in.
• 31.4 sq. in.
• 38.2 sq. in.

Tags

CCSS.HSG.C.B.5