Question

Does anyone know how to work this out?

Answer 1

without a calculator

Answer 2

ummmmmm no.......

Answer 3

yeag
gimme a sec to figure it out

Answer 4

you got r = 5 and by pythagoras h = 12

Answer 5

since
\[5^2+12^2=13^2\]

Answer 6

now just plug em in.

Answer 7

65\[\frac{65}{3}\pi\]

Answer 8

i get
\[\frac{1}{3}5^2\times 12\times \pi=100\pi\]=

Answer 9

but i often make mistakes in arithmetic. i don't see a 65 though.

Answer 10

I'm sorry.....
\[108.33\pi\]