EM-3118

Cosine rule

E Math · Secondary 4 · Medium · Cosine rule

In triangle PQR,

PQ = 7\text{ cm}

,

PR = 10\text{ cm}

and

QR = 12\text{ cm}

. Find

\angle QPR

to 1 decimal place using the Cosine Rule.

$88.0^\circ$
$41.0^\circ$
$49.0^\circ$
$92.0^\circ$

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