The perimeter of a circle is called its circumference. The formula for calculating the circumference is: C = πd (pi x diameter).
In this case, this would be 8 in. x 3.14... or about 25.13 inches.
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A circle with a diameter of 8 inches has a radius (not raduis) of 4 inches.
The circumference of a circle whose diameter is 8 inches is about 25.13 inches.
The radius will be half the diameter of 8 inches which is 4 inches
The radius of a circle is half of the diameter. Therefore, if the diameter is 16 inches, the radius would be half of 16, which is 8 inches. The radius is the distance from the center of the circle to any point on the circle's circumference.
diameter = 8 inches so the radius will = 4 inches area of a circle = pi*radius2 area = 50.26548246 or 50 square inches to the nearest square inch.