Circle Terms
What is radius?
Radius is the distance from the centre of a circle to any point of the circle.
What is the formula for area?
3.14(r^2)
A circle has a diameter of 3 inches, what is the circumference?
9.42 in
The circumference is 45cm, what is the radius?
7.16cm
A bicycle wheel has a radius of 1 foot. If the bicycle wheel rotates one time, what distance is travelled?
6.28 feet
What is diameter?
The distance across a circle measured through its centre.
The diameter is 16cm, what is the area?
200.96cm2
A circle has a radius of 16 feet. Find the circumference.
100.48 feet
The circumference of a wheel is 113.04 inches. What is the radius of the wheel?
18 inches
A large Jeep has a tire with a radius of 18 inches. Find the circumference of the wheel.
113.04 inches
What is the circumference?
The distance measured around the circle.
A circle has a radius of 50 kms. What is the area of the circle TO THE NEAREST km?
7850km2
The radius is 6cm, find the circumference.
37.68 cm
If your circumference is 72.98 what is your radius?
11.62
If the circumference of a pizza is 62cm, what is the area?
306.05cm2
What is a chord?
A straight line through the circle in any place other than the diameter and radius.
If your diameter is 7.35cm what is your area?
42.41cm2
The diameter is 16cm, what is the circumference?
50.24cm
A circle has a circumference of 18.84cm, what is the area?
28.26cm2
John owns a circular pool in his backyard. If he swims around the pool, he swims 94.2 meters. What is the radius of this circle?
15 meters
What are the two formulas to find circumference?
3.14(d) or 2(3.14)r
The radius is 6^2km, what is the area?
4,069.44km2
The diameter is 9^2cm, what is the circumference?
254.34 cm
The circumference is 23.7cm, what is the area?
44.61cm2
Matt is learning to drive a car. The steering wheel in his car has a radius of 9 inches. His instructor says "Place your hands at 10 and 2." (1/3 of the circle) What is the area of the circle formed
84.78 inches