In \( \triangle \) XYZ, XY = 13cm, YZ = 9cm, XZ = 11cm and XYZ = \( \theta \). Find cos\( \theta \)o

Assessment: JAMB UTME - Mathematics - 1985 Subject: General Mathematics

Question 1 Report

In \( \triangle \) XYZ, XY = 13cm, YZ = 9cm, XZ = 11cm and XYZ = \( \theta \). Find cos\( \theta \)o

Answer Details
cos θ  =  13 2 + 9 2 − 11 2 2 ( 13 ) ( 9 )
=  169 + 81 − 21 26 × 9
cos θ  =  129 26 × 9
= 

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