exterior vertex
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Exterior angle theorem — The exterior angle theorem is a theorem in elementary geometry which states that the exterior angle of a triangle is equal to the sum of the two remote interior angles.A triangle has three corners, called vertices . The sides of a triangle that… … Wikipedia
exterior angle — angle with a vertex common to a geometrical shape located outside of it … English contemporary dictionary
Dividing a circle into areas — In geometry, the problem of dividing a circle into areas by means of an inscribed polygon with n sides, in such a way as to maximise the number of areas created by the edges and diagonals, has a solution by an inductive method. Contents 1 Lemma 2 … Wikipedia
Feynman graph — A Feynman graph is a graph suitable to be a Feynman diagram in a particular application of quantum field theory. (The most common use is when each field has quanta (particles) associated with it as the quantum of the electromagnetic field is a… … Wikipedia
Polygon — For other uses, see Polygon (disambiguation). Some polygons of different kinds In geometry a polygon ( … Wikipedia
Triangle — This article is about the basic geometric shape. For other uses, see Triangle (disambiguation). Isosceles and Acute Triangle redirect here. For the trapezoid, see Isosceles trapezoid. For The Welcome to Paradox episode, see List of Welcome to… … Wikipedia
Angle — This article is about angles in geometry. For other uses, see Angle (disambiguation). Oblique angle redirects here. For the cinematographic technique, see Dutch angle. ∠, the angle symbol In geometry, an angle is the figure formed by two rays… … Wikipedia
Defect (geometry) — For other uses, see Defect. In geometry, the (angular) defect (or deficit or deficiency) means the failure of some angles to add up to the expected amount of 360° or 180°, when such angles in the plane would. The opposite notion is the excess.… … Wikipedia
Art gallery problem — The art gallery problem or museum problem is a well studied visibility problem in computational geometry. It originates from a real world problem of guarding an art gallery with the minimum number of guards which together can observe the whole… … Wikipedia
Curve orientation — In mathematics, a positively oriented curve is a planar simple closed curve (that is, a curve in the plane whose starting point is also the end point and which has no other self intersections) such that when traveling on it one always has the… … Wikipedia
Beijing city fortifications — The city wall of Beijing was a fortification built around 1435. It was 23.5 km long. The thickness at ground level was 20m and the top 12m. The wall was 15m high, and it had nine gates. This wall stood for nearly 530 years, but in 1965 it was… … Wikipedia
