Another term of Perimeter of a circle is known as circumference of a circle. This page is going to guide you how to find the perimeter of a circle. Not only had the procedures we have shown example problems with detailed solution, formulas and practice questions.
Circumference of circle = 2 Π r
Here the value of Π is either 22/7 or 3.14 and r represents the radius of a circle.
Here the length of the red line is known as circumference of a-circle. Now let us see some example problems to understand this topic better.
Find the circumference of a circle whose radius is 14 cm.
To find the circumference of circle we need to use the formula to find the circumference of circle.
Circumference = 2 Πr
= 2 x (22/7) x 14
= 2 x 22 x 2
= 4 x 22
= 8 cm
Find the diameter of circle whose circumference is 42 cm.
Before finding diameter of-a circle first we have to find the radius of a circle. Then we have to multiply the radius by 2 to get the diameter.
Circumference of circle = 42 cm
2 Π r = 42
2 x (22/7) x r = 42
r = (42 x 7) / (2 x 22)
r = 294/44
r = 6.68 cm
Now we have to find the diameter for that we have to multiply the radius by 2.
Diameter = 2 r
= 13.36 cm
A moon is about 384000 km away from the earth and its path around the earth is nearly circular. Find the distance traveled by moon every month.
In one month, the moon describes a full circle about the earth.
Now the circumference = 2 Π r
= 2 x (22/7) x 384000 km
= 2413714 km
Hence the distance traveled by moon every month = 2413714 km