Every circle has a point called the centre. A straight line drawn through the centre and extending both ways to intersect with the circle at opposite points is called the diameter. A straight line drawn from the centre to intersect with one point of the circle is called the radius. In this case, the length of that straight line is 12 inches.
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A circle with a radius of 5.1 inches has an area of 81.71 square inches.
Neither of the two is correct. It would be 12 inches equals a foot or 144 inches equals 12 feet.
A cylinder with a radius of 4 inches and a height of 12 inches has a volume of 603.186 cubic inches.
diameter = 2 X radius = 12 inches
The circumference of a circle if the radius is 12 equals about 75.4