Practice using the formulas for circle circumference and area with radius and diameter.
Read each problem carefully. Use C = 2πr or C = πd for circumference and A = πr² for area. Use 3.14 for π unless the problem says otherwise.
Show your work.
Use radius, diameter, pi, circumference, and area
Math - Grade 6-8
- 1
A circle has a radius of 6 cm. Find its circumference using 3.14 for π.
- 2
A circle has a diameter of 14 inches. Find its circumference using 3.14 for π.
- 3
A circle has a radius of 5 meters. Find its area using 3.14 for π.
- 4
A circular table has a diameter of 8 feet. Find the area of the tabletop using 3.14 for π.
- 5
A bicycle wheel has a radius of 13 inches. How far does the wheel travel in one full rotation? Use 3.14 for π.
- 6
A circular garden has a radius of 9 yards. Find its area using 3.14 for π.
- 7
The circumference of a circle is 31.4 cm. Find the diameter using 3.14 for π.
- 8
The circumference of a circle is 50.24 feet. Find the radius using 3.14 for π.
- 9
A circular rug has a diameter of 12 feet. Find both the circumference and the area using 3.14 for π.
- 10
Two circles both have radius 4 cm. One student says the circumference is 25.12 cm, and another student says the area is 50.24 square cm. Are both students correct? Explain.
- 11
A circular pond has an area of 153.86 square meters. The radius is 7 meters. Check whether the area is correct using 3.14 for π.
- 12
A track is shaped like a circle with a diameter of 60 meters. A runner completes 3 full laps. How many meters does the runner travel? Use 3.14 for π.