Point-a. A dimension less geometric object having no properties except location.
b. An element in a geometrically described set.

Line- A geometric figure formed by a point moving along a fixed direction and the reverse direction.

Segment- The portion of a line between any two points on the line.
 

Ray- A straight line extending from a point. Also called half-line.
A structure or part having the form of a straight line extending from a point.

Angle-a. The figure formed by two lines diverging from a common point.
b. The figure formed by two planes diverging from a common line.
 

Parallel. Of, relating to, or designating two or more straight coplanar lines that do not intersect.
b. Of, relating to, or designating two or more planes that do not intersect.
 

Perpendicular-Mathematics. Intersecting at or forming right angles.
2. Being at right angles to the horizontal; vertical. See Synonyms at vertical.
 

Skew- 1. To take an oblique course or direction.
2. To look obliquely or sideways.
 

Transversal- A line that intersects a system of other lines.
 

Congruent- a. Coinciding exactly when superimposed: congruent triangles.
b. Of or relating to two numbers that have the same remainder when divided by a third number. For example, 11 and 26 are congruent when the modules is 5.
 
 
 

Symmetry- 1. Exact correspondence of form and constituent configuration on opposite sides of a dividing line or plane or about a center or an axis. See Synonyms at proportion.
2. A relationship of characteristic correspondence, equivalence, or identity among constituents of an entity or between different entities: the narrative symmetry of the novel.
 

Complementary Angles- Two angles whose sum is 90°.

Supplementary Angles - Mathematics. The angle or arc that when added to a given angle or arc makes 180° or a semicircle. Also called supplementary angle.
 

Vertical Angles- 1. Something vertical, as a line, plane, or circle.
 

Adjacent Angles- 1. Close to; lying near: adjacent cities.
2. Next to; adjoining: adjacent garden plots.
 

Intersection- a. The point or locus of points where one line, surface, or solid crosses another.
b. A set that contains elements shared by two or more given sets.
 

Bisection- To cut or divide into two parts, especially two equal parts.

Midpoint- 1. Mathematics. The point of a line segment or curvilinear arc that divides it into two parts of the same length.
2. A position midway between two extremes.
 
 

Shapes- Something, such as a mold or pattern, used to give or determine form.
 

Plane- 1. Mathematics. A surface containing all the straight lines that connect any two points on it.
2. A flat or level surface.

Coordinate- Any of a set of two or more numbers used to determine the position of a point, line, curve, or plane in a space of a given dimension with respect to a system of lines or other fixed references.
 

Coordinate Pairs- Any of a set of two or more numbers used to determine the position of a point, line, curve, or plane in a space of a given dimension with respect to a system of lines or other fixed references.
 

Acute Angle- An angle of less than 90°.

Obtuse Angle- An angle greater than 90° and less than 180°.

Straight Angle- An angle of 180°.

Degree Measure- A planar unit of angular measure equal in magnitude to 1/360 of a complete revolution.
 

Vertex- a. The point at which the sides of an angle intersect.
b. The point on a triangle or pyramid opposite to and farthest away from its base.
c. A point on a polyhedron common to three or more sides.
 
 

Corresponding Pair Angles-
1. To be in agreement, harmony, or conformity.
2. Two persons who have something in common and are considered together.
3. The figure formed by two lines diverging from a common point.

slope- a. The rate at which an ordinate of a point of a line on a coordinate plane changes with respect to a change in the abscissa.