Correct Answer: Option B

Explanation

PR² = PQ² + QR² - 2(QR)(PQ) COS 120^o

PR² = 1² + 2² - 2(1)(2) x - cos 60^o

= 5 - 2(1)(2) x -\(\frac{1}{2}\)

= 5 + 2 = 7

PR = \(\sqrt{7}\)cm

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