EM-3056

Cosine rule

E Math · Secondary 4 · Medium · Cosine rule

In triangle XYZ,

XY = 8\text{ cm}

,

YZ = 11\text{ cm}

and

\angle XYZ = 42^\circ

. Using the Cosine Rule, find the length of

XZ

correct to 3 significant figures.

$7.37\text{ cm}$
$6.52\text{ cm}$
$9.14\text{ cm}$
$12.8\text{ cm}$

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