Question

the surface area of a spherical scented candle is 19.623cm^2. you want to stack 4 in a tube. how tall does the tube have to be to the nearest tenth?

Answer 1

Here's a plan: Use surface area formula to solve for radius; double to get diameter, then multiply by 4 to get total height. Round up.

Answer 2

your stacking them side by side? or one on top of the other?

Answer 3

on top of each other

Answer 4

surface area is 2 circles, and a cylindar

pi r^2 + pi r^2 + 2pi r h = Sa, solve for h

2pi r^2+ 2pi r h = Sa

2pi r(r+ h) = Sa

r+ h = Sa/2pi r

h = Sa/2pi r - r, times 4

H = 4(Sa/2pi r - r)

Answer 5

you really need to know the radius to determine a concrete value

Answer 6

or the height of 1 candle

Answer 7

Ok, I think i got it thank you!

Answer 8

good luck

Answer 9

Thank you very much!