Circles

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

• diameter
• radius
• π
• center

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

Which segment is the diameter?

• AC
• BD
• LM
• CE

Find the circumference of a circle with
radius = 2 cm

• 6.3 cm
• 1.26 cm
• 12.6 cm
• 126 cm

Find the circumference of a circle with diameter = 10 ft

• 3.14 ft
• 31.4 ft
• 314.1 ft
• 62.8 ft

Find the circumference of a circle with
 radius = 12 in

• 24 in
• 37.7 in
• 754 in
• 75.4 in

find the area of the circle with radius 3 cm below.

• 100 cm²
• 225 cm²
• 9 cm²
• 28.26 cm²

What is the radius of this circle?

• 18
• 10
• 9
• 8

What is/are the formula(s) to find the area of a circle?

• πr²
• 2πr
• √π

A clock face has a diameter of 10 inches. What is the approximate area of the clock face in square inches?

• 314 in²
• 31.4 in²
• 7.85 in²
• 78.5 in²