"adjacent over hypotenuse". sin^-1[sqrt(2)/3] means the right triangle has adjacent side = sqrt(3) and hypotenuse 3; you should already recognize this as a 30-60-90 triangle. The angle in question here is 60 degrees = pi/2 radians.
Best Of Luck
May 15th, 2015
Studypool's Notebank makes it easy to buy and sell old notes, study guides, reviews, etc.