Radius is 1/2 of a diameter. 2.5/2 is 1.25. Radius is necessary in finding the circumference and area of a circle.
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If the radius (not raduis) is 25 feet then the diameter is 50 feet.
It is twice its radius
Radius of circle: 25/2 = 12.5 feet
12.5 inches
Divide the diameter by 2, this will give you the radius. multiply the radius by the radius, this gives you the radius squared. Multiply the raduis squared by Pi (3.14) to get the circumference. Formula : Circumfrence = Pi X R squared so, if the diameter is 10, the radius is 5, the radius squared is 25, 25 X 3.14= circumference