# Basic Math Examples

Step 1
The circumference of a circle is equal to Pi times the diameter .
Step 2
Since the diameter is equal to times the radius , the formula for circumference using radius is .
Step 3
Substitute the value of the radius into the formula for the area of a circle. Pi is approximately equal to .
Step 4
Multiply by .
Step 5
The result can be shown in multiple forms.
Exact Form:
Decimal Form: