## Elementary Geometry for College Students (5th Edition)

Using theorem 6.3.7, we obtain: $RV \times RT = RS^2$ We know that RV is equal to RT plus 9 and that RT equals $.5RS$, so we find: $.5RS(9+.5RS) = RS^2 \\4.5RS = .75RS^2 \\ 6=RS$ RT is half of RS, so it equals 3.