Unfold the side wrapping paper of a cylindrical food can to get a square. The bottom radius of the cylindrical can is 5cm, and the height of the cylinder is 5cm______ (expressed in π)

Because the side of the cylinder is square, so the height of the cylinder = the circumference of the bottom, C = 2 π r = 2 × π × 5 = 10 π cm; answer: the height of the cylinder is 10 π cm. So the answer is: 10 π cm

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