He ōwehenga e hono ana i tētahi koki o te tapatoru hāngai ki te tāroa me te tapa e noho tauaro ana ki taua koki. E pēnei ana te tuhi i te ōwehenga (ko te A hei tohu i te koki):
Arā hoki te ture aho e hāngai ana ki ngā tapa me ngā koki o ngā tapatoru katoa.
A ratio which connects an angle of a right-angled triangle with the hypotenuse and the side opposite to the angle. With A designating the angle, the ratio is written as:
There is also a sine rule which applies to the sides and angles of all triangles.