## Elementary Geometry for College Students (7th Edition)

$YZ = 10/\sqrt 2$ = 7.07 $XY= 10/\sqrt 2$ = 7.07
By the given Figure $\angle Z=90^{\circ}$ given $\angle X=45^{\circ}$ given So remaining$\angle Y=45^{\circ}$ now XY= 10 given $YZ = 10/\sqrt 2$ = 7.07 $XY= 10/\sqrt 2$ = 7.07 By Theorem 5.5.1/ (45-45-90 Theorem)