Surface area = 4*pi*402 = about 20106 square units
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A circle with a radius of 40 cm has an area of 5,026.55 square cm.
Radius = 3.57 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 .
The area is 5,024 ft2. The formula for finding the area of a circle is: A = pi * r2 A for area. The r is for the radius. A = 3.14 * 40 ft2 A = 3.14 * 160 ft2 A = 5,024 ft2
the cylinder