Numerical answer
A cylindrical pipe has radius 7 cm and height 10 cm. Find its curved surface area in cm² (use π = 22/7).
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Answer: 440
Curved surface area of a cylinder = 2πrh = 2 × 22/7 × 7 × 10 = 2×22×10 = 440 cm². The 7 in the radius cancels neatly with the 7 in π = 22/7, which is a useful shortcut whenever the radius is a multiple of 7.
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