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The answer is 1017.87601976.
A circle with a radius of 18 centimeters has an area of 1017.88 square centimeters.
Area of the circle: pi*6 squared = 36*pi square inches
Area of a circle is (pi)(R)2 .If diameter =12, then radius = 6,and Area = (pi)(6)2 = 36 pi .Full circle = 360 degrees.10 degrees = 10/360 = 1/36 of the full circle.Area of the sector ('slice') = (full area)/36 = (36 pi)/36 = pi = 3.142 square units (rounded)
The diameter is 11.5.