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Let, the radius, height and slant height of the cone be 'r' cm, 'h' cm, and 'l' cm. r = (42/2) = 21 cm h = 21 - 1 = 20 cm So, l2 = 212 + 202 = 441 + 400 Or, l2 = 841 Since, the slant height cannot be negative. So, l = 29 So, the curved surface area of the cone = π X r X l = (22/7) X 21 X 29 = 1,914 cm2
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