Question 1 Report
In \( \triangle \) XYZ, XY = 13cm, YZ = 9cm, XZ = 11cm and XYZ = \( \theta \). Find cos\( \theta \)o
Answer Details
cosθ θ = 132+92−1122(13)(9) 13 2 + 9 2 − 11 2 2 ( 13 ) ( 9 ) = 169+81−2126×9 169 + 81 − 21 26 × 9 cosθ θ = 12926×9 129 26 × 9 = 4378
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