Area of a circle: A = π r 2 = π d 2 /4 Circumference of a circle: C = 2 π r = π d. Circle Calculations: Using the formulas above and additional formulas you can calculate properties of a given circle for any given variable. Calculate A, C and d | Given r Given the radius of a circle calculate the area, circumference and diameter. Applying the formula, Area = pi * r 2, find the area of each circle. Find the radius from diameter and apply the formula to find the area of a circle. Each printable worksheet has 9 problems on finding area of a circle with the known radius or diameter. Two simple word problems and one story problem included.

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    Example: find the area of a circle. Task 1: Given the radius of a cricle, find its area. For example, if the radius is 5 inches, then using the first area formula calculate π x 5 2 = 3.14159 x 25 = 78.54 sq in.

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    To compute the area of the circle, we first observe that since the diameter of the circle is 8 inches, its radius is 4 inches. Now we use the formula for the area of a circle: A = πr2 Area of circle = π(42) = π(16) ≈ 50.24 sq. in. Now we subtract: Area of shaded region = 100 - 50.24 = 49.76 sq. in.

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