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Circumference: 14*pi mi

Area: 49*pi square mi

Q: What is the circumference and area of a circle with a radius of 7 mi?

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Circumference of any circle = (pi) x (diameter) Diameter = 2 x radius

15.0

A circle with a radius of 11.5 miles has an area of 415.48 square miles.

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

6790 mi = 35,851,200 in

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Circumference of any circle = (pi) x (diameter) Diameter = 2 x radius

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.

That depends on what is meant by 38 mi but the circumference of any circle is 2*pi*radius or diameter*pi

Using 3.14 as Pi the area of circle is: 200.96

Using 3.14 as Pi the area of circle is: 120.7016

15.0

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

A circle with a radius of 11.5 miles has an area of 415.48 square miles.

The circumference of a circle with diameter d is pi*d So if d = 8mi then circumference = 25.13 mi.

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

Circumference = pi*diameter So diameter = circumference/pi = 9.87 mi

For a circle with a radius of 4 miles, the area is about 50.26 square miles. A = pi r2 A = 3.1416 x (4)2 = 3.1416 x 16 = approximately 50.2656 sq. mi.