Gw mau tau Abu Sahl al-Kuhi dari Matematik pada zaman pertengahan Islam. Jelasin dalam bahasa melayu

Persian mathematician Abu Sahl Waijan ibn Rustam al-Quhi (10th century), also known as Abu Sahl al-Kuhi or just Kuhi, was a leading figure in a revival and continuation of Greek higher geometry in the Islamic world. He studied optics and investigated the optical properties of mirrors made from conic sections. He also did some important work on the centers of gravity.