Precalculus
(212,212)\left(\frac{21}{2},\frac{21}{2}\right)
(213,212)\left(21\sqrt3,\frac{21}{2}\right)
(2132,−212)\left(\frac{21\sqrt3}{2},-\frac{21}{2}\right)
(2132,212)\left(\frac{21\sqrt3}{2},\frac{21}{2}\right)(2213,221)