# Xeno is a spherical planet with a diameter of 2160 Kms

#### aricho

Intelligent beings on the plantet Xeno have developed a unit of distance called the xen.

The number of square xens in the surface area of Xeno is exactly the number of cubic zens in its volume.

If Xeno is a spherical planet with a diameter of 2160 Kms, how many km are there in one Xen.

The Answer is 360, but i am confused with the method.

thanks..

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#### whozum

Start by figuring out the surface area's equivalence to the volume. The planet is a sphere..

#### aricho

ok, heres wat i got i dont know if this it right though?

Let n be the number of square or cubed xens
let x be the number of xens

n(1)=n(2)

n(1)x^2= 4 (pi) r^2
n(1)=4(pi)r^2/x^2

Simariarly, volume

Is that correct?

#### whozum

I'm not really sure what you're doing. The first thing I'd do is figure out the planet's surface area and volume in km.

#### aricho

i did that you get huge numbers

i'll write it
N one= N two (given)

N one time x squared= 4 pi r^2
N one= 4 pi r^2 divided by x^2

Is that correct>?

#### aricho

Hello? help!...................

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