In deriving the formula for calculating the volume of a cylinder, Xiao Hua divided the 8 cm high cylinder into 32 parts It is known that the surface area of the cuboid is 64 square centimeters larger than that of the original cylinder, and the radius of the bottom of the original cylinder is? Cm?

In this way, the area of the bottom of the cuboid remains unchanged, while the area of two cuboids with the radius of the cylinder as the width and the height of the cylinder as the length will be increased on the side
64 / 8 / 2 = 4cm

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