Rays: $\displaystyle{\stackrel{{\to}}{{{E}{A}}}},{\stackrel{{\to}}{{{E}{C}}}}\usepackage{cmbright}\Huge\$

Lines: $\displaystyle{\stackrel{{\leftrightarrow}}{{{E}{D}}}},{\stackrel{{\leftrightarrow}}{{{B}{E}}}}\usepackage{cmbright}\Huge\$