A
If the radius of a circle is 5 cm, what is the diameter?
10 cm
If the diameter of a circle is 14 cm, what is the radius?
7 cm
State the formula for the circumference of a circle.
2 x pi x r OR pi x d
State the formula for the area of a circle.
pi x r^2
A circle has a radius of 10 cm. Write its circumference in terms of pi.
2 x pi x 10 = 20pi
A circle has a diameter of 20 cm. Find its circumference in terms of pi.
20pi
A circle has a radius of 7 cm. Find its area in terms of pi.
49pi
A circle has an area of 25pi cm^2. What is its radius?
5 cm
A circle has a circumference of 12pi cm. What is its diameter?
12 cm
Find the circumference of a circle with radius 6 cm, correct to 1 decimal place.
37.7 cm
A circular pond has a diameter of 18 m. Find its area to the nearest whole number.
254 m^2
A circles has a radius of 15 cm. Find the exact circumference in terms of pi.
30pi cm
The area of a circle is 81pi cm^2. Find the diameter.
18 cm
A circular track has circumference 31.4 m. Find its radius, use pi = 3.14.
5 m
A pizza has a radius of 12 cm. Find its area to the nearest whole number.
452 cm^2
A sector of a circle has radius 10 cm and angles 90 degrees. Find its area in terms of pi.
25pi cm^2
A circle has radius 12 cm. Find the arc length of a 60 degree sector in terms of pi.
4pi cm
A sector of a circle has angle 120° and radius 8 cm. Find the arc length correct to 1 decimal place.
16.8 cm
A sector of a circle has radius 7 cm and angle 180°. Find its area in terms of π.
24.5π cm²
A circle has radius 20 cm. Find the area of a 45° sector to the nearest whole number.
157 cm²
A sector has an arc length of 6π cm and radius 9 cm. Find the angle of the sector in degrees.
120°
The area of a sector is 50π cm^2 and the radius is 10 cm. Find the angle of the sector.
180°
A circular field has radius 21 m. A 60° sector is fenced. Find the length of fencing needed around the curved edge (arc length).
21.99 m
A wheel of radius 30 cm rolls once in a straight line. How far does it travel?
188.5 cm
A circular garden bed has an area of 314 m². Find its radius to 1 decimal place (use π ≈ 3.14).
10.0 m