maths

Surface area of cone$=πrs+πr_{2}$

where r is the radius of the base of the cone and s is the slant height.

We know that surface area of cone$=940m_{2}$

$r=14m$

$π=3.14$

Substituting the values in the formula we get

$⇒940=3.14×1×4s+3.14×14_{2}$

$⇒940=43.96×s+3.14×196$

$⇒940=43.96×s+615.44$

$⇒940−615.44=43.96×s$

$⇒324.56=43.96×s$

$⇒s=43.96324.56 $

$⇒s=7.38≈7m$

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