CIRCUMFERENCE OF A CIRCLE
- it is the distance length
of a circle around the circle.
Illustration:
Formula:
C = 2 πr
or
C = πd
where:
C = circumference
r = radius
d = diameter
π = pi = 3.1416
Problem:
1. Find the circumference of a circle whose radius is 4 inches.
Given:
r = 4 in.
Required: Circumference:
Solution: ( since the given is radius, it is better to use the formula C = 2 πr ).
Therefore from the formula C = 2 πr.
C = 2 πr
C = 2 *π* 4in.
C = 8 π in.; final answer
1. What is the circumference of a circle whose diameter measures 2 feet.
Given:
d = 2 ft.
1. What is the circumference of a circle whose diameter measures 2 feet.
Given:
d = 2 ft.
Solution: ( since the given is diameter, it is better to use the formula C = πd ).
From the formula C = πd.
C = πd
C = π* 2ft.
C = 2 π ft.; final answer
