Question

Find the surface area of the cone in terms of pi.
A. 12π cm2
B. 24π cm2
C.16.5π cm2
D. none of these

Answer 1

This should help:

Answer 2

thank you!

Answer 3

i can never recall the pi rs and tend to have to reinvent it each time :)

Answer 4

I still didn't get the right answer. i dont understand what im doing wrong.

Answer 5

Did u find the length of the slant side?

Answer 6

No. im not completely sure on how to do that.

Answer 7

\[a^2+b^2=c^2\] Live by it !

Answer 8

Therefore \[s=\sqrt{a^2+b^2}\]

Answer 9

I got 25. Is that correct?

Answer 10

http://0.tqn.com/d/math/1/0/t/L/conerr.jpg

Answer 11

Not quite:\[s=\sqrt{3^2+4^2}=5\]

Answer 12

Nw substitute the value of s and r in \(\pi rs+\pi r^2\) to find the surface area.

Answer 13

okay thank you! i believe i got it now.

Answer 14

Great :) Good luck!