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In the figure above KL NM LN bisects lt KNM If ... - JAMB Mathematics 2014 Question

In the figure above, KL//NM, LN bisects < KNM. If angles KLN is 54o and angle MKN is 35o, calculate the size of angle KMN.
A
91o
B
89o
C
37o
D
19o
correct option: c

In the diagram above, (\alpha) = 54o(alternate angles; KL||MN) < KNM = 2(\alpha) (LN is bisector of < KNM) = 108o

35o + < KMN + 108o = 180o(sum of angles of (\bigtriangleup))

< KMN + 143o = 180o

< KMN = 180o - 143o

= 37o

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