Question

Find the slant height of a cone with r = 3, surface area of 89 and pi = 3.14.
Answer 6.45
13.24
28.26
60.74

Answer 1

surface area=pi r(r+l)
l is the slant height

Answer 2

so it would be 89=3.14 times radius ^2 ?

Answer 3

yeap

Answer 4

so i would divide 89 by 3.14 then what?

Answer 5

we appear to be looking for a height in order to apply the pythag thrm to this

Answer 6

so i have to use the theorum?

Answer 7

maybe, but this is much cooler i think

http://www.wolframalpha.com/input/?i=cone+r+%3D+3++surface+area%3D+89

Answer 8

cool did youdo that?

Answer 9

Since the height of the cone is not given, u have to use the formula. Pythagoras theorem isnot applicable here

Answer 10

o ok but i keep getting the wrong answer

Answer 11

wolfram did it; i just typed in the information :)

Answer 12

cool