There is a cylinder machine part with a height of 6.28 cm, and its side is just a square. Find the surface area of the part

The side unfolding is just a square, that is, height = base perimeter = 6.28cm, side area = 6.28x6.28 = 39.4384cm 2
Bottom radius = 6.28 / 2 / 3.14 = 1cm, bottom area = 3.14x (1) ^ 2 = 3.14cm2
So the surface area of this part = side area + 2x bottom area = 45.7184 square centimeter

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