#### Answer

RS=6$\sqrt 5$$\approx$13.4

#### Work Step by Step

OV=OR
(.5RS)$^2$=81-36=45
.5RS=3$\sqrt 5$
RS=6$\sqrt 5$$\approx$13.4

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RS=6$\sqrt 5$$\approx$13.4

OV=OR
(.5RS)$^2$=81-36=45
.5RS=3$\sqrt 5$
RS=6$\sqrt 5$$\approx$13.4

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