Circumference Practice

Halfway across the widest part of a circle; from the edge to the center.

• Pi

• Radius

• Diameter

• Circumference

The length across the center of a circle.

• Pi

• Radius

• Diameter

• Circumference

a mathematical constant that is the ratio of a circle's circumference to its diameter; used in finding the circumference and area of a circle

• Pi

• Radius

• Diameter

• Circumference

The distance around the outside of a circle

• Circumference

• Pi

• Diameter

• Radius

What formulas can I use to find the circumference of a circle? Select all that apply

• 2πr

• π + radius

• πd

• πr²

Find the circumference of the circle.

• 3.14 cm

• 37.68 cm

• 75.36 cm

• 452.16 cm

Find the circumference of the circle.

• 3.14 mm

• 51 mm

• 204 mm

• 320.28 mm

What is the circumference of this semi circle? (Use 3.14 = π and round to the nearest tenths place)

• 18.5 m

• 11.3 m

• 20.3 m

• 22.6 m

A circular swimming pool is 21 feet in diameter.

How many feet around is the pool?

• 10.5 ft

• 42 ft

• 65.94 ft

• 131.95 ft

An architect is making a plan for a new circular playground. If the picture below is the playground, how much fencing needs to go up to keep the kids in the circle? Use 3.14 for π.

• 3,215 m

• 200.96 m

• 402.12 m

• 100.06 m