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It will be bigger than if the radius were 20 mi and smaller than if it were 22 mi.

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10.5

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Q: What if the radius is 21 mi?

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The area of a circle of radius 21 is 1386

21/(2*pi) = a radius of about 3.342253805 units

If the height is 9 and the volume is 21, then the radius = 0.8618

A circle with a radius of 21 inches has a circumference of 131.95 inches.

Circumference: 14*pi mi Area: 49*pi square mi

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The perimeter of a cirlcle is its circumference which is: 2*pi*radius or diameter*pi

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.

The area of a circle of radius 21 is 1386

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

21/(2*pi) = a radius of about 3.342253805 units

If the height is 9 and the volume is 21, then the radius = 0.8618

A circle with a radius of 21 inches has a circumference of 131.95 inches.

area circle = π × radius² = π × (400 miles)² = 160000π sq mi ≈ 502655 sq mi

The volume of a sphere with a radius of 21 units is: 12,348 units 3

A circle with a radius of 21 meters has a circumference of 131.95 meters.

Circumference: 14*pi mi Area: 49*pi square mi

The radius is 3.34 units.