👉 In geometry, a cathetus is a line segment that connects two vertices of a polygon. It is also known as a side or edge. For example, in a triangle, the catheti are the sides that form the right angle with each other. Catheti can be used to calculate lengths and distances between points on a plane. They are often denoted by lowercase Greek letters such as $\overline{AB}$, $\overline{BC}$, or $\overline{CA}
