👉 Semiruin is a concept in geometry that refers to the intersection of two circles. It is named after the Greek mathematician and philosopher Pythagoras, who was known for his work on the subject. In the context of semiruins, each circle is divided into two equal parts, which are called semispheres (or "semirings"). These semispheres are then connected by lines or segments to form a closed shape. The intersection of these two circles is an important concept
