Posted by G on Friday, November 9, 2012 at 3:09pm.
we know that x^2 + y^2 = r^2 so y^2 = r^2 - x^2 also sinØ = x/r x = rsinØ x^2 = r^2 sin^2 Ø so y^2 + 8x = 0 r^2 - x^2 + 8x = 0 r^2 - r^2 sin^2 Ø + 8r sinØ = 0