Expression 63: "t" Subscript, 9 , Baseline equals StartFraction, "v" "X" Subscript, 5 , Baseline minus "y" Subscript, 1 , Baseline "X" Subscript, 5 , Baseline plus "x" Subscript, 1 , Baseline "Y" Subscript, 5 , Baseline minus "h" "Y" Subscript, 5 , Baseline minus "v" "X" Subscript, 6 , Baseline plus "y" Subscript, 1 , Baseline "X" Subscript, 6 , Baseline minus "x" Subscript, 1 , Baseline "Y" Subscript, 6 , Baseline plus "h" "Y" Subscript, 6 , Baseline Over "v" "h" minus "v" "x" Subscript, 2 , Baseline plus "y" Subscript, 1 , Baseline "x" Subscript, 2 , Baseline minus "y" Subscript, 1 , Baseline "h" minus "x" Subscript, 1 , Baseline "y" Subscript, 2 , Baseline plus "x" Subscript, 1 , Baseline "v" plus "h" "y" Subscript, 2 , Baseline minus "h" "v" , EndFractiont9=vX5−y1X5+x1Y5−hY5−vX6+y1X6−x1Y6+hY6vh−vx2+y1x2−y1h−x1y2+x1v+hy2−hv