A = Pi x R² (Pi = 3.1416, R² = 1/2 diameter multiplied by itself) 3.1416 x 36 113.0976 sq mm
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-- Find the circumference of a full circle with a diameter of 12 mm.-- The perimeter of the semi-circle is(1/2 the circumference of the full circle) + (the diameter).
The area of a circle with a diameter of two cm is about 3.1416 cm.
The area of a circle if the diameter was s 7ft is 38.48ft
Area of a circle = (1/4) x (pi) x (square of the diameter)
The area of a circle with a diameter of 10 centimeters is: 78.54 cm2