Has side lengths and

MATHEMATICS · Subjective · A Level · Mathematics · Trigonometry · Trigonometry

Problem

\triangle PQR

has side lengths

PQ = 20\,\text{cm}

and

QR = 21\,\text{cm}

. Its area is

210\,\text{cm}^2

. (a) Determine the length of the third side

PR

. (b) Find the perimeter of

\triangle PQR

.

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