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the area of a circle is represented by the following equation; A=pi*R2 where A is area, pi is the number pi (3.1415926.......for most high school maths, 3.14 is suitable) and R is the radius. So, square your radius, and multiply it by pi.

Q: What is the area of a circle with a radius 2.1 centimeters?

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Its just the area of a circle 21 inches or 21 centimeters? area of a circle is (pi)*r2 where pi = 3.1415.... and r = radius thus A = (3.1415)*(diameter/2)2 u can figure out the answer from that with a calculator

If radius=21 ft, then diameter = 2*radius = 42 ft

132cm

the radius is 10.5 inches. * * * * * Wrong! Circumference = 2*pi*Radius Or, Radius = Circumference/(2*pi) So circumference = 21 inches implies radius = 3.34 inches (to 3 sf)

The radius of the circle is 21 inches. The area of the circle is (pi) times (radius squared) = pi times 441 = 1,385.44+ square inches. 1 square foot = 144 square inches. The area of the circle is (1385.44+ square inches) divided by 144 = 9.621 square feet (rounded to 3 decimal places).

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About 1385.44cm2

The area of a circle of radius 21 is 1386

A circle with a radius of 21 cm has an area of ~1,385.44 square cm

Its just the area of a circle 21 inches or 21 centimeters? area of a circle is (pi)*r2 where pi = 3.1415.... and r = radius thus A = (3.1415)*(diameter/2)2 u can figure out the answer from that with a calculator

Using 3.14 as Pi the area of circle is: 1384.74

A circle with a radius of 21 units has an area of 1,385.44 square units.

Area = pi*212

Using 3.14 as Pi the area of circle is: 1384.74

About 1385.44cm2

If the area is a circle and the radius of the circle is 21 miles, the distance around the circle (circumference) is 131.95 miles. The area of that circle is 1,385.4 square miles.

A circle with a radius of 21 yards has an area of 1,385.44 square yards.

The area is 441 times pi.