Circles

Which is the center?

• K

• H

• $\overline{JI}$

• I

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

What is BJ?

• Secant

• Radius

• Chord

• Tangent

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

What is DG?

• Secant

• Radius

• Chord

• Tangent

What two formulas can you use to find the circumference?

• C = π·d

• C = π·r²

• C = 2·π·r

• C = d²

What is the diameter?

• 5 in

• 10 in

• 3.14 in

• 2.5 in

What is the measurement around the outside of a circle called?

• Diameter

• Circumference

• Radius

• Center

Find the circumference with a diameter of 14.8 m. Use 3.14 for pi.

• 48.7 m

• 104.4 m

• 93 m

• 46.5 m