radius
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its 2 pie r squared BUT you have to add back the base (a circle) which is pie r2 The original formula is 4 pie r squared Your new formula is (2 pie r squared + pie r squared)
Area of a circle = pi*radius2
It isn't. That is the formula for the AREA of a circle!
It is a circle, so use the formula "pie r squared" to figure it out
Area: (pi)(r)2