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

If the circumference of a circle is 44 π feet, what is the radius?

• 22 ft
• 44 ft
• 33 feet
• 3.14 feet

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

12 inches in this circle represents its

• radius

• diameter

14cm in the circle represents its

• radius

• diameter

Find the circumference of the circle

• 50.24 yd

• 25.12 yd

• 11.14 yd

Find the circumference of the circle whose radius is 4 in

• 12.56 in

• 25.12 in

• 50.24 in

Find the circumference of the circle

• 18.84 cm

• 75.36 cm

• 37.68 cm

What is the area of this circle?

• 1385.44
• 2142.12
• 5541.77
• 1289.12