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...

explementary angles (see § Combining angle pairs below). Vertical angles are formed when two straight lines intersect at a point producing four angles. A pair...

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...

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

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...

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

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...

an external sex organ (intromittent organ) through which males urinate and ejaculate, as in other placental mammals. 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...

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...

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...

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...

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

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...

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

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

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...

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...

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...

sides and roof of the neurocranium. In humans, each bone is roughly quadrilateral in form, and has two surfaces, four borders, and four angles. It is...

three straight beams of square cross-section which meet pairwise at right angles at the vertices of the triangle they form. The beams may be broken, forming...

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...

extend from the internal occipital protuberance to the lateral angles of the bone; those grooves accommodate the transverse sinuses, and their prominent...

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

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...

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