Math
Circles and circumference.
Definition
A circle is a set of all points in a plane that are the same distance (radius) from a center point. The circumference is the distance around the circle, calculated using the radius or diameter.
Examples
Real-world.
- 1 A bicycle wheel with a 14-inch diameter has a circumference of about 44 inches
- 2 Finding how much fencing is needed to enclose a circular garden
- 3 Calculating the distance traveled in one revolution of a merry-go-round
Key Fact
C = 2πr = πd; A = πr²