👉 In mathematics, a trisection is a division of an angle into thirds. It is the process of dividing an angle into three equal parts and measuring each part. This can be done by using a protractor, which has markings that indicate the measure of each of the three angles formed when the entire angle is divided into thirds. For example, if you have an angle of 60 degrees, it would be divided into thirds. The first third would be 30 degrees, the second