The radius of a right circular cylinder is 7 cm. Its height is twice its radius. What is the curved surface area of the
cylinder? (Take $$\pi = \frac{22}{7}$$)
radius r = 7cm
height h = 2r = 14cm
curved surface area of cylinder = 2$$\pi$$rh = $$2\times\frac{22}{7}\times7\times14$$= 616 $$cm^2$$
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