Adjacent

Next to; neighboring

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Altitude

The shortest distance between the base of a geometric figure and its top, whether that top is an opposite vertex, an apedex, or another base.

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Angle

Two rays sharing a common endpoint. Angles are typically measured in degrees

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Base

The bottom of a figure. If the top is parallel to the bottom (as in a trapezoid or prism), both the top and bottom are called bases.

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Between

Point B is between points A and C if it is on the line segment connecting A and C. 

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Bisector

A line segment, line, or plane that divides a geometric figure into two congruent halves.

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Center

A point or place that is equally distant from the sides or outer boundaries of something

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Chord

A line segment on the interior of a circle. A chord has both endpoints on the circle

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Circle

The locus of all points that are a fixed distance from a given point

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Collinear

Lying on the same line.

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Concave

A shape or solid which has an indentation or "cave". Formally, a geometric figure is concave if there is at least one line segment connecting interior points which passes outside of the figure.

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Conditional

a statement that tells if one thing happens, another will follow

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Congruent

Exactly equal in size and shape. Congruent sides or segments have the exact same length. Congruent angles have the exact same measure. For any set of congruent geometric figures, corresponding sides, angles, faces, etc. are congruent

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Converse

the "if" and "then" parts of a sentence are switched

if q then p

Coordinate

Coordinates are a set of values that show an exact position.

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Corresponding

Two features that are situated the same way in different objects.

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Edge

• Edges are the intersection of faces in a three-dimensional figure.

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Equation

An equation is a mathematical statement that two things are equal. It consists of two expressions, one on each side of an 'equals' sign

ax² + bx + c = 0

Equilateral

Having all sides or faces equal.

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Exponent

• A mathematical notation that implies the number of times a number is to be multiplied by itself.

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Formula

An expression used to calculate a desired result, such as a formula to find volume or a formula to count combinations. Formulas can also be equations involving numbers and/or variables

square = a ²

Function

A function is a special relationship between values: Each of its input values gives back exactly one output value.

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Graph

A diagram that exhibits a relationship, often functional, between two sets of numbers as a set of points having coordinates determined by the relationship.

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Horizontal

Intersect

The point where two lines meet or cross

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Isosceles

having two sides of equal length

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Line

The geometric figure formed by two points. A line is the straight path connecting two points and extending beyond the points in both directions.

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Logic

Median

 A line segment joining a vertex to the midpoint of the opposing side. 

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Midpoint

The point halfway between two given points

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Negation

Parallel

extending in the same direction, equidistant at all points, andnever converging or diverging

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Perpendicular

2 Lines intersecting at a 90° angle

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Point

A precise location or place on a plane

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Polygon

A closed plane figure for which all sides are line segments

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Proof

Proportion

Two variables with ratios that are constant

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Positive

A quantity greater than zero

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Quadrilateral

A polygon with four sides.

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Radical

An expression that has a square root, cube root, etc.

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Ratio

relative sizes of two or more values

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Reflection

A transformation in which a geometric figure is reflected across a line, creating a mirror image. That line is called the axis of reflection

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Rotation

A transformation in which a plane figure turns around a fixed center point.

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Segment

A straight line which links two points without extending beyond them

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Similar

Identical in shape, although not necessarily the same size

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Skew

Lines in three dimensional space that do not intersect and are not parallel.

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Tangent

A line which touches a circle or ellipse at just one point

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Transitive

Whenever A is related to B and B is related to C, then A is related to C

a = b and b = c, then a = c

Transversal

A line that cuts across a set of lines or the sides of a plane figure

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Triangle

A polygon with three sides

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Vertex

A corner point of a geometric figure

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Vertical

Straight up and down. A line on the coordinate plane where all points on the line have the same x-coordinate.

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