Something that has position but not extension, as the intersection of two lines.
A part cut off from a figure, esp. a circular or spherical one, by a line or plane, as a part of a circular area contained by an arc and its chord or by two parallel lines or planes.
A surface generated by a straight line moving at a constant velocity with respect to a fixed point .
The space within two lines or three or more planes diverging from a common point, or within two planes diverging from a common line.
Lines that intersect and meet at a 90 degree right angle .
Lines that extend forever and never cross each other.
A closed plane figure having three sides and three angles.
A triangle containing a right angle.
A polygon having five angles and five sides.
A polygon having six angles and six sides.
A rectangle having all four sides of equal length.
A parallelogram having four right angles.
A quadrilateral plane figure having two parallel and two nonparallel sides.
A figure that has four sides so that the two opposite sides are parallel and the other two sides are parallel to each other.
A closed plane curve consisting of all points at a given distance from a point within it called the center.
A surface or solid bounded by two parallel planes and generated by a straight line moving parallel to the given planes and tracing a curve bounded by the planes and lying in a plane perpendicular or oblique to the given planes.
A solid geometric figure generated by the revolution of a semicircle about its diameter; a round body whose surface is at all points equidistant from the center .