#reference angle formulae

[er-cryptid]

Reference Angle Formulae

Quadrant I -- degree( r ) = degree

Quadrant II -- degree( r ) = 180 - degree -- degree( r ) = pi - degree

Quadrant III -- degree( r ) = degree - 180 -- degree( r ) = degree - pi

Quadrant IV -- degree( r ) = 360 - degree -- degree( r ) = 2(pi) - degree