What is the equation for area of a circle
Mathematics · High School · Tue Nov 03 2020
Answered on
Determine the equation for the area of a circle.
Formula for the area of the circle: A = πr^2
A = Area
r = radius
To further understand the given concept behind the area of the circle, refer to the example below.
Example.
Find the of a circular pond with a diameter of 30m.
Since in solving for the radius of a circle, we need to know it's radius, and on the equation, we are given a diameter, then we must first determine the radius.
d = 2r
Diameter is equal to 2 times the radius
r = d/2
r = 10/2
r = 5 m
Now that we have the radius of the circle, we can simply solve the area of the circle.
A = πr^2
A = π(5)^2
A = 25π
A = 78.54 m^2