r = radius. d = diameter. C = circumference. A = area. π = pi = 3.1415926535898. √ = square root. Use this circle calculator to find the area, circumference, radius or diameter of a circle. Given any one variable A, C, r or d of a circle you can calculate the other three unknowns. Units: Note that units of length are shown for convenience.. Area of a Half Circle: Area_ {semicircle} = Area of a Circle 2. Area_ {semicircle} = \pir2 2. Whereas if you are interested in finding the area of a full circle, you can also do that with the help of our another circle calculator in no time. Perimeter_ {semicircle} = (Circumference 2) + 2 ∗ radius.

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Just to remind you, here's the formula again that you can use to find the area when the diameter is known. Example 4:Find the approximate area of a circle whose radius has a length of [latex]2.5[/latex] centimeters. Note: Use [latex]\large{\pi} = 3.1416[/latex]. Round your final answer to two decimal places.. This calculator will calculate the area of a circle given its diameter, using the famous formula area = pi times (d/2) squared. It supports different units such as meters, feet, and inches. Just type into the box and hit the calculate button.. The radius is half the diameter. Area = π * (Diameter / 2) 2. Diameter of a Circle.