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6 September, 11:02

In ∆PQR, PQ = 39 cm and PN is an altitude. Find PR if QN = 36 cm and RN = 8 cm.

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  1. 6 September, 11:09
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    First, find PN: PN²=PQ²-NQ²=39²-36²=225

    so PN=√225=15

    next, find PR: PR²=PN²+RN²=15²+8²=289

    therefore, PR=√289=17
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