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O^2=81-9=72
O=√72
T^2=2√11^2 -√15^2
T^2=44-15
T=√29
N^2=7^2+3√3^2
N^2=49+27
N=√76
K^2=2√23^2-5^2
K^2=92-25
K=√67
R^2=5^2+6^2
R^2=25+36
R=√61