Question

Find the surface area of the a cone which has dimensions of 7 and 3.

Answer 1

The surface area of a right circular cone is found by the formula:

SA = pi*r^2 + pi*r*L where r is the base radius and L is the slant height. pi*r^2 is the area of the circular base.

Answer 2

SA = pi*r^2 + pi*r*L
SA = pi* 4^2 + pi*4*7
SA - ?

Answer 3

@SadieK Note that the drawing shows the length of the base diameter, not its radius.

Answer 4

is it 138?

Answer 5

Is that what you got?

Answer 6

Yes.

Answer 7

I had 44 pi which approximates to 138.26.

Answer 8

Thank you. I am going to close this question and ask my last one.

Answer 9

OK.