Circumference Choice Practice

What is circumference and its formula?

• distance (amount) around a circle

• amount that is inside the circle

Tom has a circular garden, and he wants to place a fence around it. The circular garden has a radius of 5 meters. What is the circumference of the circular garden? (Use 3.14 for pi)

• 30.4ft

• 30.4m

• 32m

• 31.4m

The circumference of Tyler's bike tire is 72 inches. What is the diameter of the tire? (Use 3.14 for pi and round to the nearest tenth)

• d=113.05 in

• d=226.1 in

• d=11.5 in

• d=22.9 in

The diameter of a bike wheel is 30 inches. If a wheel travels 15 complete rotations, how far does the bike travel? (Use 3.14)

• 450 in

• 1413 in

• None of the above

• 94.2 in

What is the diameter?

• 8
• 16
• 10
• 4

What is the radius?

• 18
• 72
• 38
• 14

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

• C = π x radius

• C = 2 x π x radius

• C = π x Diameter

• C = 2 x π x Diameter

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

• C = π x radius

• C = 2 x π x radius

• C = π x Diameter

• C = 2 x π x Diameter

Cynthia wants to buy a round photo frame for her brother. The radius of the photo frame is 9 cm. What is the photo frame’s circumference?

• 28.26 cm

• 56.52 cm

• 4.5 cm

• 18 cm

What is the circumference of this circle?

• 3.14 cm

• 37.68 cm

• 6 cm

• 68.4 cm