A, O and B lie on a straight line segment where a = 61°, b = 20° and c = 39°. State the value of the angles: i) ∠AOB ii) ∠ZOB iii) ∠XOY iv) ∠AOY v) ∠YOZ
AOB = 180°
ZOB = c = 39°
XOY = b = 20°
AOY = a + b = 61 + 20 = 81°
YOZ = 180 - a - b - c = 180 - 61 - 20 - 39 = 60°
