•sum of the angles in a triangle = 180° •sum of the angle in a quadrilateral = 360° •opposite angles are equal •for two parallel lines and a transversal, corresponding angles are equal, and alternate angles are equal. •If it already has an angle for a triangle subtract that by 180 and divide it by two you have the other two angle, if you already have two angles on a triangle add those together and subtract from 180 thats the last angle, same for a quadrilateral but you subtract by 360 instead.
