pentagon

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

arbelos is a plane region bounded by three semicircles connected at the corners, all on the same side of...

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

circle a round plane figure whose boundary – the circumference – consists of points equidistant from a fixed point...

point a small, round mark on a line, plan, or map to show the position of something...

sphere an object shaped like a round ball...

cardioid A heart-like form, is a plane curve traced by a point on the perimeter of a circle that...

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