### square

square a flat shape with four sides of equal length and four angles of 90°

### triangular prism

triangular prism A triangular prism is a three-sided prism; it is a polyhedron made of a triangular base, a translated copy, and 3 faces joining...

### square pyramid

square pyramid a pyramid having a square base. If the apex is perpendicularly above the center of the square, it will have C4v symmetry...

### superellipse

superellipse a closed curve resembling the ellipse, retaining the geometric features of semi-major axis and semi-minor axis, and symmetry about them, but a different overall...

### ellipse

ellipse a curve in a plane surrounding two focal points such that the sum of the distances to the two focal points is constant for...

### deltoid curve

deltoid curve a hypocycloid of three cusps. In other words, it is the roulette created by a point on the circumference of a circle as...

### Archimedean spiral

Archimedean spiral The Archimedean spiral, or arithmetic spiral, is a spiral named after the 3rd century BC Greek mathematician Archimedes. It is the locus of...

### arbelos

arbelos is a plane region bounded by three semicircles connected at the corners, all on the same side of a straight line (the baseline) that...

### star polygon

star polygon is a type of non-convex polygon. A regular star pentagon, {5/2}, has five corner vertices and intersecting edges...

### decagon

decagon is a ten-sided polygon or 10-gon. A regular decagon has all sides of equal length and each internal angle will always be equal to...