Chemistry
posted by gnozahs .
Xrays with a wavelenth of 1.70A scatter at an angle of 21.5 degrees from a crystal. If n=1, what is the distance between planes of atoms in the crystal that give rise to this scatterying?
So far I've gotten .367 radians but I have no idea where to go from there.

n*lambda = 2d*sin theta.
solve for d.