Special right triangle allows one to quickly calculate various lengths in geometric problems without resorting to more advanced methods. "Angle-based" special right triangles are specified by the relationships of the angles of which the triangle is composed. The angles of these triangles are such that the larger (right) angle, which is 90 degrees or radians, is equal to the sum of the other two angles. The side lengths are generally deduced from the basis of the unit circle or other geometric methods. This approach may be used to rapidly reproduce the values of trigonometric functions for the angles 30°, 45°, and 60°. Special
Venous angle Venous angle Venous angle (Pirogoff's angle, Latin: "angulus venosus") is the junction of the internal jugular (latin: v. jugularis interna) and subclavian (latin: v. subclavia) veins at both sides of the neck. The external and the anterior jugular and the vertebral veins converge toward it. The left venous angle receives lymph from the thoracic duct (ductus thoracicus). The right venous angle receives lymph from the right lymphatic trunk (truncus lymphaticus). Truncus lymphaticus is only about 1 cm long and conveys lymph from the right side of the thorax (including parts of the liver) as well as the right arm and