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\sqrt{QR^{2}+ RV^{2} } = \sqrt{ 12^{2}+ 9^{2} } = \sqrt{144+81} = \sqrt{225} = 15
misal tipot = O
segi3 PQO, PO =
\sqrt{PQ^{2}+ QO^{2} } = \sqrt{18^{2} + (15/2)^{2} } = \sqrt{324+(225/4)} = \sqrt{1521/4} = 39/2