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Math problem: the height of cylinder decreases by 4 cm, and the surface area decreases by 125.6 cm. What is its volume?
Circumference of cylinder bottom: 125.64 = 3 1.4 (cm)

Radius of cylinder bottom: 3 1.4 ÷ 3. 14 ÷ 2 = 5 (cm).

Bottom area: 3. 14× 5× 5 = 78.5 (square centimeter)

Use the area at the bottom of the cylinder × the height of the original cylinder = the volume of the cylinder.

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