PowerPoint Presentationbr 1br Lbr ds=dxbr Obr 2br Abr Bbr ybr xbr 1br BO: x=0 0≤y≤2br Obr 2br Abr Bbr ybr xbr 1br x=3t y=2t z=t 0≤t≤1br AObr