The proeprty of rhombus is that
The diagnol of a rhombus VX bisect the angle WVY in two equal parts .
Therefore, the angle YVX = angle XVW.
[tex]\angle YVX=(9n+4)^{\circ}[/tex]
The another property of rhombus is that the diagnol are perpendicular .
[tex]3n^2-0.75=90[/tex]
