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Kite (geometry) A kite, showing its pairs of equal-length sides and its inscribed circle. In Euclidean geometry, a kite is a quadrilateral with reflection symmetry across a diagonal. Because of this symmetry, a kite has two equal angles and two pairs of adjacent equal-length sides. Kites are also known as deltoids, [ 1 ] but the word deltoid ...
Colorful delta-wing kite... Kites are tethered flying objects which fly by using aerodynamic lift, requiring wind (or towing) for generation of airflow over the lifting surfaces. Various types of kites exist, [ 1 ] depending on features such as material, shape, use, or operating skills,Wind required. Kites may fly in air, water, or other fluids ...
Various kites being flown Star-shaped kite above a meadow south of Hockenheim. This sparless, ram-air inflated kite, has a complex bridle formed of many strings attached to the face of the wing. A kite is a tethered heavier-than-air or lighter-than-air craft with wing surfaces that react against the air to create lift and drag forces. [2]
For example, Dudeney invented the hinged dissection, [95] while Gardner wrote about the "rep-tile", a shape that can be dissected into smaller copies of the same shape. [ 96 ] [ 97 ] Inspired by Gardner's articles in Scientific American , the amateur mathematician Marjorie Rice found four new tessellations with pentagons.
Norman-style kite shield. [1]A kite shield is a large, almond-shaped shield rounded at the top and curving down to a point or rounded point at the bottom. The term "kite shield" is a reference to the shield's unique shape, and is derived from its supposed similarity to a flying kite, although "leaf-shaped shield" and "almond shield" have also been used in recent literature. [2]
An example of a concave polygon. A simple polygon that is not convex is called concave , [ 1 ] non-convex [ 2 ] or reentrant . [ 3 ] A concave polygon will always have at least one reflex interior angle —that is, an angle with a measure that is between 180 degrees and 360 degrees exclusive.
Penrose's original version of this tiling used four shapes: regular pentagons and pentagrams, "boat" figures with three points of a pentagram, and "diamond" shaped rhombi. [49] The kite and dart Penrose tiling uses kites with three interior angles of 72° and one interior angle of 144°, and darts, concave quadrilaterals with two interior ...
The tetrahedron is one kind of pyramid, which is a polyhedron with a flat polygon base and triangular faces connecting the base to a common point. In the case of a tetrahedron, the base is a triangle (any of the four faces can be considered the base), so a tetrahedron is also known as a "triangular pyramid".