Chojin,
if there are right angle between the planes containing x and y and the planes containg x and E, you should have:
x = 2 * 18.4 = 36.8 and
y = E / 2
That will simplify your problem.
Korman
Chojin,
if there are right angle between the planes containing x and y and the planes containg x and E, you should have:
x = 2 * 18.4 = 36.8 and
y = E / 2
That will simplify your problem.
Korman