Q : What is the circumference of a circle with a radius of 5 inches ?
Ans: The formula to calculate the circumference is 2 X Pie X radius. The value of radius is given as 5 inches. Substituting the value of r in the above formula then we get as the value of Pie is 22/7 = 2 X (22/7) X 5 = 220/7 = 31.41 sq. Inches.
Also,
Q: What is the circumference of a circle with a radius of 12inches??
A: The circumference is 75.366 inches, because the formula is 2 x Pie x r
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Circumference = 2 x pi x radius = 31.4159
r = ~0.8 inches.
The circumference of a circle of radius 5 is about 31.42
Circumference: 2*pi*5 = 10*pi inches
Circumference = 31.4 inches, approx. Area = 78.5 square inches, approx.