The answer is to use the metric system like the rest of the world.
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A ball is a spherical shape and the formula for finding the volume of a sphere is: Volume = 4/3 x pi x radius3 Diameter of the ball = 9 and 9/16 inches so the radius will be half of this which is 4.78125 inches. Volume = 4/3 x pi x 4.781253 = 457.8391924 cubic inches. Therefore the volume of air in the ball is 458 cubic inches correct to three significant figures.
The volume is 346.36 cubic inches.
The volume of a cylinder that measures 18 inches high and has a diameter of 9 inches is 1,145.11 cubic inches.
A right circular cone whose slant height is 9 inches and whose base has a diameter of 2 inches will have a volume of 36.757 cubic inches.
Volume = 1/3*pi*r2*h = 254.5 cubic inches.