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for the surface area:4 times pie times radius squared for volume:4/3 times pie times radius cubed
For a rectangle: length times width For a triangle: length times width divided by two For a circle: pie times radius squared For a rectangular prisim: length times width times height For a sphere: four thirds pie times radius cubed
area of what? circle is pie times the radius squared, rectangle is base times height, and a square is the side squared
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: (pi)(r)2