Question

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?

Answer 1

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

Answer 2

No

Answer 3

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

Answer 4

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

Answer 5

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

Answer 6

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

Answer 7

sorry I'm really bad at math :/

Answer 8

the volume will double

Answer 9

ok, so I double the 2.5

Answer 10

yep

Answer 11

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

Answer 12

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

Answer 13

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!