A regular decagonal prism has a volume of 2.5. If each one of its edges is doubled in size, what would be its new volume?

Question

anonymous · Answer

do you know the equation for the volume of a decagon?

anonymous · Answer

No

anonymous · Answer

V = (5 eh / 2)cot(18)
where e is the edge length of the base and h is the height of the prism

anonymous · Answer

so if each one if its edge lengths were doubled then we get
V =(5*2eh /2)cot(18)

anonymous · Answer

but how can I solve it using what they gave me?

anonymous · Answer

which is equal to (10eh/2)cot(18)

anonymous · Answer

sorry I'm really bad at math :/

anonymous · Answer

the volume will double

anonymous · Answer

ok, so I double the 2.5

anonymous · Answer

yep

anonymous · Answer

Ok I think I got it, thank you so much!! :D

anonymous · Answer

i'm not sure if its the correct though :X

anonymous · Answer

It's ok at at least I get it now because I sure didn't have any idea on how to solve it so thank you!