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The height of a cone is 4cm, slant height 5cm. Calculate total surface area

Answer»

Height of cone = 4 cm

Slant height = 5 cm

Radius = \(\sqrt{(5)^2-(4)^2}=\sqrt{25-16}\)

\(\sqrt{9}=3\) cm

Surface area = π (3)2 + π x 3 x 5 = 9 π + 15 π = 24 π cm2



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