Area = length X height
Area = (length X height) / 2
Circumference = 2π X radius OR π X diameter
Area = π(radius)2 OR 0.7854 (diameter)2
Surface area = π(diameter)2
Surface area = (π X diameter X slope) / 2
+ area of base if solid (see circle above).
Surface area = π X diameter X height
+ area of ends if solid (see circle above).
Surface area = 2(height X length) + 2(height X width) + 2(length X width)
π = 3.1416
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