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If the slant height of a cone is 60 cm and the radius of its base is 21 cm, then find its curved surface area.[Use $$\pi = \frac{22}{7}$$]
3880 $$cm^{2}$$
3820 $$cm^{2}$$
3960 $$cm^{2}$$
4020 $$cm^{2}$$
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