The asymptotes of $x^2$/$a^2$ - $y^2$/$b^2$ = 1 are y = +/-$\frac{b}{a}$x, obtained by setting the RHS to 0. The asymptotes pass through the centre and are diagonals of the rectangle with sides 2a and 2b. The angle between asymptotes is 2arctan$\frac{b}{a}$. Key relations: equation of hyperbola + equation of conjugate = 2(equation of asymptotes). For a rectangular hyperbola (a = b), asymptotes are perpendicular (y = +/-x).