Question

What is the surface area of cone below Diameter AB=21 and distance from B to C =36

Answer 1

1533.88261311522

Explanation:

Let r be the radius of the (base/circle)

and L be the slant height of the cone

Formula ………………………………………………………………………………………………………

The surface area of a cone = the (curved/lateral) surface area + the base

`=\pi r^(2)\ \ \ +\ \ \ \pi Lr`

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`r=(21)/(2) =10.5`

L = BC = 36

`\text{surface area} =\pi \left( 10.5\right)^(2) +\pi * 36* \left( 10.5\right)`

`=346.360590058275 + 1187.52202305694`

`=1533.88261311522`