Find the Circumference circle (5)

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