maths

Curved surface area of a cone $=πrl$

Hence, curved surface area of this cone $=π×40×l=1640π$

$⇒l=41cm$

For a cone, $l=h_{2}+r_{2} $

Hence, $41=h_{2}+40_{2} $

$⇒1681=h_{2}+1600$

$⇒h_{2}=81$

$⇒h=9cm$

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