I know there's some nerdy LSD joke about non-euclidean geometry to made here - somehow...
And a joke about how Ringo gets no respect! (Listening to She Said, She Said at the moment - Ringo is great!)
Anyway - yeah, it's an obtuse triangle.
Put them in a plane, with Paul at the origin and John on the positive x-axis. George will be in the 4th quadrant. Use trigonometry to figure out the x and y cooridnate for George. Hopefuly after that you'll know how to answer this problem.