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In the figure below, K,L,M and M are points on the circumference of a circle centre O. The points K,O,M and P are on a straight line. PN is a tangent to the circle at N. Angle KOL=1300 and angle MKN=400.

Find the values of the following angles, stating the reasons in each case:
(a) ∠ MLN
(b) ∠ OLN
(c) ∠ LNP
(d) ∠ MPN