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Q: What is the area of the circle if the diameter is 40 inches inches?

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Area of circle =(11/14) * d *d d denotes diameter. For your case answer is 7.1365 inches

The circumference of a circle, if the diameter is 40 inches, is about 125.7 inches. (C = d x Pi).

Area of a circle = πr² (remember that r or radius is exactly half of the diameter) Radius therefore = 40/2 = 20 inches Thus the Area = 3.14159 × 20 squared = 1256.636 square inches

A ≈ 1,256.64

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

If the diameter of a circle is 40 m then the area (in terms of Pi) is: about 400pi m2

40'

Using 3.14 as Pi the area of circle is: 1256.0

A=Ï€rÂ², and r=d/2, so r=40 inches and A = 1600Ï€ sq in = 5026.55 sq in

In order to find the diameter of a circle if you have the area is to rearrange the formula for the area of a circle to put diameter as the unknown, like so: PIE*d = Area of a Circle d = (Area of a Circle) / PIE Therefore if the area of your circle is 40cm, 40/PIE = 12.73cm and that's the diameter.

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

Radius = 3.57 inches.

400 x pi squinches

1256 inches ++ Another Answer ++ The formula for finding the Circumference of a circle is C = Pi x D where D is Diameter and Pi is 3.1416. The Radius of a circle is one-half of the Diameter, hence the Diameter of a circle with a 20-inch Radius is 40 inches. Using the formula above, multiply 40 x 3.1416 to find the Circumference: 40 x 3.1416 = 125.664 inches.

Area of circle: pi times radius squared

80 inches (d = r x 2)

Area = pi*202 = 1256.637 square feet to 3 d.p.

What do you mean? 40 inches = 40 inches.

In order to even discuss this question, we must assume that the unit of the '40' is the square of the unit of the '4'. -- The radius, diameter, and circumference of the circle with an area of 40 are each 10.794% shorter than the corresponding measurement in the circle with radius = 4 . -- Its area (40) is 20.423% less than the area of the circle with the radius of 4 .

40 centimeters. The size of a circle is typically stated by giving its diameter. The circumference of a 40 cm circle (distance around the outside) is 40 x pi or about 125.66 cm.

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

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

Diameter = 31 m So area = pi*(d/2)^2 = 755 m^2, approx.

Estimate: 3*40 = 120 inches Actual: pi*39 = 122.5 inches to one decimal place

Caliber is in reference to the diameter of the bullet. A .40 (which is what I have) is .40 inches in diameter. A .50 caliber is .50 inches in diameter (half an inch). So a caliber is the inches in diameter. Not including the 9mm which I cannot stand