👉 In mathematics, a "semisection" is a division of a segment into two equal parts. This is commonly used in geometry and trigonometry to divide an angle into two segments or to create an angle that can be considered half of any other angle. For example, if one divides a circle into 4 equal segments, the resulting angles would each measure 90 degrees. Semisections are often used in trigonometric functions such as sine and cosine because they allow for the creation