& Find the Curved surface area of and the total surface of
a cone whose height is 28 cm and diameter is 42cm
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Answered by
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Answer:
h= 28cm
d= 42cm
So r= 42/2 = 21 cm
Slant height = √h square + r square
= √28 square + 21 square
= √784+ 441
= √1225
= 35
CSA = πrl
= 22/7 × 21 × 35
= 2310 cm square
TSA = πr(l+r)
= 22/7 × 21 ( 35 + 21)
= 22/7 × 21 × 56
= 3696 cm square
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