A, O and B lie on a straight line segment where a = 20, b = 48 and c = 36. State the value of the angles: i) ∠

A, O and B lie on a straight line segment where  a  = 20°,  b  = 48° and  c  = 36°.  State the value of the angles: i)  ∠ A O B  ii) acute  ∠ Z O B  iii) acute  ∠ X O Y  iv) acute  ∠ A O Y  v) acute  ∠ Y O Z