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The formula, when the radius is known, is: A = PI(r)2 A circle with a radius of 450 mm has an area of 636,172.51 square mm.
Calculate the area of the circle of 101 mm radius. Multiply this by the length of 656 mm. Divide the result by 1,000.
Would be the area of a circle.Area = pi * radius squaredA = pi*r2radius = diameter/2Radius = 4 mm/2 = 2 mmArea of quarter = (3.14)(2 mm)2= 12.6 mm2========
The radius of a circle is always half of the distance of the diameter. If you have a 24 mm diameter - then the radius would be 12 mm.
A circle with a radius of 15.5 mm has a circumference of 97.39 mm.