The area of a circle is given by the formula A =π r²
Therefore 121π = π r² : 121 = r² : r = √121 = 11
The circumference of a circle is given by the formula C = 2πr
C = 2 x 11π = 22π or 69.115 (to 3 decimal places)
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The circumference of a circle is the distance arround the edge of the circle. The area of a circle is how big the inside of the circle is.
The area of a circle that has a circumference of 16pi is: 201.1 units2
The area of a circle, if its circumference is 20π, is: 314.16 square units.
If the area of a circle is 28.26 the circumference is: 18.84 units.
The circumference of a circle when the area is 69cm2 is about 29.4 cm