In the figure below, /MX/ = 8cm, /XN/ = 12cm, /NZ/ = 4cm and ∠ XMN = ∠ XZY. Calculate /YM/

Assessment: JAMB UTME - Mathematics - 2018 Subject: General Mathematics

Question 1 Report

In the figure below, /MX/ = 8cm, /XN/ = 12cm, /NZ/ = 4cm and ∠ XMN = ∠ XZY. Calculate /YM/

Answer Details
From the figure,
∠ XMN = ∠ XZY
Angle X is common
So, ∠ XNM = ∠ XYZ
Then from the angle relationship
X M X Z  =  X N X Y  =  M N Z Y
XM = 8, XZ = 12 + 4 = 16,
XN = 12, XY = 8 + YM
8 16  =  12 ( 8 + Y M )
Cross multiply
8(8 + YM) = 192
64 + 8YM = 192
8YM = 128
YM =  128 8
= 16cm

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