3.3) Let \(\vec{u} = <0, 1, 1>\), \(\vec{v} = <2, 2, 0>\) and \(\vec{w} = <-1, 1, 0>\) be three vectors in standard form.
(a) Determine which two vectors form a right angle triangle?
(b) Find \(\theta := \widehat{\vec{u}\vec{w}}\), the angle between the given two vectors.