Question

if PQ=7cm and QR=9cm , find PR. To find PR don't measure length with scale. Find it numerically.


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Answer 1

Answer:

$\sqrt{138}$

${7}^{2} + {9}^{2} = {pr}^{2} \\ 49 + 89 = 138 = {pr}^{2} \\ pr = \sqrt{138}$

PR square=PQsquare+QR square