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What is the surface area of a cone of base diameter 30 centimetres and height 40 centimetres? |
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Answer» Radius = \(\frac{30}{2}\) = 15 cm = r Height = h = 40 cm Total surface area = Base area + Curved surface area = πr2 + πrl Slant height = \(\sqrt{h^2+x^2}=\sqrt{40^2+15^2}\) = \(\sqrt{1825}\approx\) 42.72 πr2 + πrl = 225π + π x 15 x 42.72 = 865 πr = 2718.6 m2 |
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