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In triangle XYZ: XZ = 10 cm; YZ = 8 cm; cos Z = 1/8. Calculate the length of XY.

We can use the cosine rule to determine the lenght of XY.
XY²= 10²+8²-2108cos ZXY² = 100+64-180(1/8) = 144XY = 12

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Answered by Vencel H. • Maths tutor

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