An angle bisector is a line which divides an angle into two equal halves. That is it bisects one angle into two congruent angles. These two congruent angles are adjacent angles as they share a common leg. Here is a simple online calculator to calculate the angle bisector of two planes. In the below calculator, enter the values for "A, B, and C" to obtain the result as the angle bisector of two planes. For the lines of 'r' and 's', the equations are represented as A1X + B1Y + C1 and A2X + B2Y + C2 respectively.