Question

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

Answer 1

Answer:

1533.88261311522

Step-by-step 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

                                             $=\pi r^{2}\ \ \ +\ \ \ \pi Lr$

=========================================

$r=\frac{21}{2} =10.5$

L = BC = 36

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

                   $=346.360590058275 + 1187.52202305694$

                   $=1533.88261311522$