261–264  The sum of the internal angle and the external angle on the same vertex is π radians (180°). The sum of all the internal angles of a simple polygon...

air) are not refracted into the second ("external") medium, but completely reflected back into the first ("internal") medium. It occurs when the second medium...

vertex A, or the excenter of A. Because the internal bisector of an angle is perpendicular to its external bisector, it follows that the center of the...

angles, alternate exterior angles, alternate interior angles, corresponding angles, and consecutive interior angles. The angle addition postulate states...

angles, the external angle bisectors (supplementary angle bisectors) at the other two vertex angles, and the external angle bisectors at the angles formed...

of tiling the plane. A hexagon also has 6 edges as well as 6 internal and external angles. 6 is the second smallest composite number. It is also the first...

related to total internal reflection. Total internal reflection describes the fact that radiation (e.g. visible light) can, at certain angles, be totally reflected...

The Euler angles are three angles introduced by Leonhard Euler to describe the orientation of a rigid body with respect to a fixed coordinate system....

testicular artery, cremasteric artery; 3 fascial layers: external spermatic, cremasteric, and internal spermatic fascia; 3 other structures: pampiniform plexus...

Pitch angle in bevel gears is the angle between an element of a pitch cone and its axis. In external and internal bevel gears, the pitch angles are respectively...

lengths, this will reverse the internal and external angles. For an even-sided direct equiangular polygon, with internal angles θ°, moving alternate edges...

The Order of Nine Angles (ONA or O9A) is a Satanic left-hand path and terrorist network that originated in the United Kingdom, but has since branched...

'tail') is an external sex organ (intromittent organ) through which males urinate and ejaculate, as on other animals. Together with the testes and surrounding...

categories: External and Internal. Gears with teeth on the outside of the cylinder are known as "external gears". Gears with teeth on the internal side of...

center is external, the two figures are directly similar to one another; their angles have the same rotational sense. If the center is internal, the two...

engines, each of which are internal combustion engines on the same principle as previously described. In contrast, in external combustion engines, such...

component, which is the landing point of parameter (external) rays of angles 1/7 and 2/7 Internal ray for angle 1/3 of main cardioid made by conformal map from...

triangles △ABD and △ACD: Angles ∠ ADB and ∠ ADC form a linear pair, that is, they are adjacent supplementary angles. Since supplementary angles have equal...

divide in the neck to form the external and internal carotid arteries. The common carotid arteries are present on the left and right sides of the body. These...

other joints, for example the shoulder, and are described as internal or external. Other terms, such as elevation and depression, describe movement above...

involved in motor and reward pathways. The internal capsule is V-shaped in transection forming an anterior and posterior limb, with the angle between them...

cartilages of the true ribs, and at the anterior extremities of the cartilages of the false ribs, and extend backward as far as the angles of the ribs, hence they...

circle has negative radius and the other has positive radius) the external and internal homothetic centers and external and internal bitangents are switched...

muzzle-velocities of many mortar-weapons which are meant to be fired at high angles of elevation with heavy projectile arcs. Caseless ammunition weapons are...

a range of speeds as set using a wired external hand controller, and an upward-pointing shaft set on an angle through the ridge can be made to rotate...

dielectric metasurfaces. While at the Brewster angle there is no reflection of the p polarization, at yet greater angles the reflection coefficient of the p polarization...

vascularised and blood supply is provided by the three pudendal arteries. Venous return is via the external and internal pudendal veins. The organs and tissues...

internal spin axis can be called a pole; for example, Earth's rotation defines the geographical poles. A rotation around an axis completely external to...

either rincón or esquina, depending on whether it is to mean its internal or external angle. Simple word-based translation cannot translate between languages...

{\displaystyle 4\pi } . Solid angles can also be measured in squares of angular measures such as degrees, minutes, and seconds. A small object nearby...