Find the Area circle (21)

Math
r=21
The area of a circle is equal to Pi π times the radius r squared.
π⋅(radius)2
Substitute in the value of the radius r=21 into the formula for the area of a circle. Pi π is approximately equal to 3.14.
π⋅212
Raise 21 to the power of 2.
π⋅441
Move 441 to the left of π.
441π
The result can be shown in multiple forms.
Exact Form:
441π
Decimal Form:
1385.44236023…
Find the Area circle (21)

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