Mathematics

PQRS is a quadrilateral, PQ=7cm, QR=8cm and PR=7.5cm. (a) Calculate angle PSR (b) Hence if SR=SP, calculate angle SPR

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  1. In triangle PQR, use the law of cosines to determine the angles.
    Unfortunately, just knowing that triangle PSR is isocseles tells you nothing about its other sides or angles.

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