Double angle and half angle in mathematics refer to the formulas used to express trigonometric functions of angles equal to 2a or 1/2a. These are known as the double-angle and half-angle formulas.
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To bisect an angle is to divide the angle in half.
The first angle that is half as large as the other angle is 30º The other angle that is the larger is 60º
One half of a right angle is a 45 degree angle.
A bisector divides an angle in half (usually in the form of a line passing through the centre of the angle).
an angle subtended by an arc is double at the center