To find the area of a circle, you can use two simple formulas:
Using Radius:
The most common formula is
( A = \pi r^2 )
Here, ( A ) stands for the area, and ( r ) is the radius (the distance from the center of the circle to the edge).
Using Diameter:
If you know the diameter (( d )), you can use this formula:
( A = \frac{\pi d^2}{4} )
Remember, the radius is half of the diameter.
Example:
Let’s say you have a circle with a radius of 3 cm. To find the area, you would do the following:
( A = \pi (3)^2 = 9\pi )
This means the area is approximately
( 28.27 \text{ cm}^2 ).
So, the area of a circle with a radius of 3 cm is about 28.27 square centimeters.
To find the area of a circle, you can use two simple formulas:
Using Radius:
The most common formula is
( A = \pi r^2 )
Here, ( A ) stands for the area, and ( r ) is the radius (the distance from the center of the circle to the edge).
Using Diameter:
If you know the diameter (( d )), you can use this formula:
( A = \frac{\pi d^2}{4} )
Remember, the radius is half of the diameter.
Example:
Let’s say you have a circle with a radius of 3 cm. To find the area, you would do the following:
( A = \pi (3)^2 = 9\pi )
This means the area is approximately
( 28.27 \text{ cm}^2 ).
So, the area of a circle with a radius of 3 cm is about 28.27 square centimeters.