Question

Find the TSA of a cone if its slant height is 21 cm and diameter of the base is 24 cm.



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Answer 1

Answer:

slant h =21 m = l

l = 21 m

d = 24 m

d = 2 × r

r =12 m

total surface area = 22/7 × 12 ( 21 + 12 )

22/7 × 12 × 33

1244.57 m²

Answer 2

Explanation:

$Given,</p><p></p><p>Slant height of cone is l=21 m.</p><p></p><p> Diameter of its base is d=24 m.</p><p></p><p>hence, radius of its base is r=2d=12 m.</p><p></p><p>Now, the total surface area of cone is given by</p><p></p><p>S=πrl+πr2</p><p></p><p>S=π(rl+r2)</p><p></p><p>S=π(12×21+122)</p><p></p><p>S=π(252+144)</p><p></p><p>S=722×396</p><p></p><p>hence, S=1244.57 m2</p><p></p><p>$

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