Triangle PQR is right-angled at vertex R. Calculate the length of PR, if $P Q = 34$ cm and $Q R = 33.6$ cm.

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Solution

According to Pythagoras Theorem
$Q R^{2} + R P^{2} = P Q^{2} \Rightarrow R P = \sqrt{(34)^{2} - (33.6)^{2}} = \sqrt{27.04} = 5.2 c m$

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