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A ≈ 126,000 square miles.

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Q: What is the area of a circle with a diameter of 400 miles?
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If a circle has the diameter of 40 in what is the area?

Area of circle: pi*20^2 = 400*pi square units


What is the diameter of a circle is the area is 400pie?

area = pi x diameter squared/4 = 400 pi diameter squared = 4 x 400 x pi/pi = 1600 diameter = sqrt 1600 = 40


Find the area of a circle with the diameter of 40m?

The area of a circle is (pi) times (the radius)2. The radius of the given circle is 1/2 of the diameter = 20m. Area = (pi) times (20)2 = 400(pi) = 1,256.64 square meters(rounded)


What is the radius of a circle with a diameter of 400?

The radius of a circle is always 1/2 its diameter.


How many square cm is a circle of 40 cm diameter?

Area of the circle: pi*20*20 = 400*pi square cm


What is the area of a circle with a diameter of 40 inches?

Area = pi * r2r = d/2 = 40/2 = 20Area = 400*pi= 1,256.636 approximate


How many Square miles in 400 mile radius?

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


What is the area of a circle with a diameter of 40 cm?

πr^2 = 3.142 * 20 * 20 = 3.14159 * 400 = 1256.636 cm^2


What is the area of a circle if the diameter is 400 feet?

Area = pi times radius2 where radius = 200 feet therefore area = pi times 2002 Area = 125 663.7 feet2


If the radius of a circle is doubled what happens to the area of the circle?

the area of the circle is increased by 400%


If a circle has area of 400 square units then what is the radius?

If a circle has area of 400 square units then its radius is: 11.25 units.


What is the raduis of a circle that is inside a square with an area of 400 cm?

Assuming the circle is tangent to the sides of the square, then the edges of the circle meet the square at the midpoint on each of the four sides. So the diameter of the circle is the same as the length of a side of the square. So all you need to do is find the length from the total area by taking the square root of the area (since A = s2), which gives you the diameter, then halve it to get the radius.