Question

The surface area of a cone whose radius is 5 cm and whose height is 12 cm is _____ cm². Use 3.14 for π.

264.2
266.9
282.6
296.4

Answer 1

use the formula shown here

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

Answer 2

first you need s

--------------

r^2 + h^2 = s^2

5^2 + 12^2 = s^2

25 + 144 = s^2

s^2 = 169

s = 13

-------------

now onto the surface area

SA = pi*r^2 + pi*r*s

SA = 3.14*5^2 + 3.14*5*13

SA = ???

Answer 3

204.1

Answer 4

@jim_thompson5910

Answer 5

@jim_thompson5910

Answer 6

SA = 3.14*5^2 + 3.14*5*13

SA = 282.6