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The surface area of a right cone which has a base diameter of 6 units and a height of 8 units is:

A) 75 units squared.

B) 108 units squared.

C) 151 units squared.

D) 188 units squared.

pwolfey  Nov 16, 2017
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Surface Area = Lateral area + Base area

Radius =Diameter/2

              =6/2 =3

Slant Height =sqrt[8^+ 3^2]

                        =8.544

Lateral area=Slant Height x Pi x Radius

                      =8.544 x 3.141592 x 3

                      =80.525 units squared

Base Area =Pi x r^2

                    =3.141592 x 3^2

                    =28.274 units squared

Surface Area =80.525 + 28.274

                        =108.8 =~109 units squared.

Note: Because I used Pi to 6 decimal places instead of 2 decimal places, I got the answer closer to 109.

Guest Nov 17, 2017
edited by Guest  Nov 17, 2017

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