Math glossary
A
AAS
(angle-angle-side) |
(noun)
Triangles are congruent if two pairs of corresponding angles and a pair of opposite sides are equal in both triangles. (www.mathopenref.com) |
Adjacent Interior Angle
|
(noun)
Any two interior angles that share a common side are called the "adjacent interior angles" of the polygon, or just "adjacent angles". (www.mathopenref.com) |
Alternate Exterior Angle
|
(noun)
The pairs of angles on opposite sides of the transversal but outside the two lines are called Alternate Exterior Angles. (www.mathsisfun.com) |
Alternate Interior Angle
|
(noun)
The pairs of angles on opposite sides of the transversal but inside the two lines are called Alternate Interior Angles. (www.mathsisfun.com) |
Arc Measure
|
(noun)
The angle that an arc makes at the center of the circle of which it is a part. (www.mathopenref.com) |
ASA
(angle-side-angle) |
(noun)
Triangles are congruent if any two angles and their included side are equal in both triangles. (www.mathopenref.com) |
B
Base
|
(noun)
The surface that a solid object stands on, or the bottom line of a shape such as a triangle or rectangle. (www.mathsisfun.com) |
Base Angles of an Isosceles Triangle
|
(noun)
The base angles of an isosceles triangle are the two angles with the same measure, each formed by the intersection between the base of the triangle and one of the two legs. (wiki.answers.com) |
Bisect
|
C
Central Angle
|
(noun)
The angle in a circle whose vertex is the center of the circle is called the Central Angle. (www.icoachmath.com) |
Chord
|
Circumcenter
|
(noun)
In geometry, the circumscribed circle or circumcircle of a polygon is a circle which passes through all the vertices of the polygon. The center of this circle is called the circumcenter and its radius is called the circumradius. (www.google.com) |
Coincide
|
Compass
|
(noun)
A Compass is an instrument use for drawing circles or parts of circles like arcs. (www.mathatube.com) |
Complementary Angle
|
Concentric
|
(adjective)
Of or denoting circles, arcs, or other shapes that share the same center, the larger often completely surrounding the smaller. (www.google.com) |
Congruent
|
Conjecture
|
(noun)
A generalization resulting from inductive reasoning. |
Construct
|
Converse
|
Corresponding Angles
|
(noun)
When two lines are crossed by another line (which is called the Transversal), the angles in matching corners are called corresponding angles. (www.mathsisfun.com) |
Counterexample
|
(noun)
An example that refutes or disproves a hypothesis, proposition, or theorem. (www.thefreedictionary.com) |
Cross Section
|
(noun)
A 2D plane that fits inside a 3D shape. |
Cube
|
(noun)
A symmetrical three-dimensional shape, either solid or hollow, contained by six equal squares. (www.google.com) |
Cylinder
|
(noun)
A solid geometric figure with straight parallel sides and a circular or oval section. (www.google.com) |
D
Decagon
|
Deductive Reasoning
|
Diameter
|
(noun)
A straight line passing from side to side through the center of a body or figure, esp. a circle or sphere. (www.google.com) |
Dodecagon
|
E
Equiangular
|
Equilateral
|
Exterior Angle
|
(noun)
The Exterior Angle is the angle between any side of a shape, and a line extended from the next side. (www.mathsisfun.com) |
F
Flowchart
|
(noun)
A diagram of the sequence of movements or actions of people or things involved in a complex system or activity. (www.google.com) |
G
H
Hendecagon
|
(noun)
An eleven-sided polygon. |
Hexagon
|
HL
(hypotenuse-leg) |
(noun)
Two right triangles are congruent if the hypotenuse and one corresponding leg are equal in both triangles. (www.mathopenref.com) |
I
Icosagon
|
(noun)
A twenty-sided polygon. |
Included Angle
|
Included Side
|
Inductive Reasoning
|
Isosceles Triangle
|
J
K
Kite
|
(noun)
A 4-sided flat shape with straight sides that: * has two pairs of sides. * each pair is adjacent sides (they meet) that are equal in length. Also, the angles are equal where the pairs meet. Diagonals (dashed lines) meet at a right angle, and one of the diagonal bisects (cuts equally in half) the other. (www.mathsisfun.com) |
L
Legs
|
(noun)
In a right triangle, a leg is either of the two sides that form the right angle. (www.mathgoodies.com) |
Line
|
Linear Pair
|
M
N
Nonagon
|
(noun)
A nine-sided polygon. |
O
Octagon
|
P
Parallel
|
Parallelogram
|
Pentagon
|
Perpendicular
|
Perpendicular Bisector
|
(noun)
A perpendicular bisector is a line or a ray which cuts another line segment into two equal parts at 90 degrees. (easycalculation.com) |
Plane
|
(noun)
A flat surface on which a straight line joining any two points on it would wholly lie. (www.google.com) |
Point
|
Polygon
|
(noun)
A plane figure with at least three straight sides and angles, and typically five or more. (www.google.com) |
Protractor
|
(noun)
An instrument for measuring angles, typically in the form of a flat semicircle marked with degrees along the curved edge. (www.google.com) |
Q
R
Rectangle
|
(noun)
A plane figure with four straight sides and four right angles, esp. one with unequal adjacent sides, in contrast to a square. (www.google.com) |
"Regular" Polygon
|
Remote Interior Angle
|
(noun)
The remote interior angles are the two angles inside the triangle that do not share a vertex with the exterior angle. (www.emathematics.net) |
Rhombus
|
(noun)
A parallelogram with opposite equal acute angles, opposite equal obtuse angles, and four equal sides. (www.google.com) |
S
SAS
(side-angle-side) |
(noun)
Triangles are congruent if any pair of corresponding sides and their included angles are equal in both triangles. (www.mathopenref.com) |
Scalene Triangle
|
Sketch
|
(noun)
A freehand drawing without using any geometry tools. |
Sphere
|
(noun)
A round solid figure, or its surface, with every point on its surface equidistant from its center. (www.google.com) |
Square
|
SSA
(side-side-angle) |
(noun)
Given two sides and non-included angle (SSA) is not enough to prove congruence. (www.mathopenref.com) |
SSS
(side-side-side) |
(noun)
Triangles are congruent if all three sides in one triangle are congruent to the corresponding sides in the other. (www.mathopenref.com) |
Supplementary Angle
|
T
Tetrahedron
|
Theorem
|
(noun)
A general proposition not self-evident but proved by a chain of reasoning; a truth established by means of accepted truths. (www.google.com) |
Trapezoid
|
U
V
Vertex
|
Vertex Angle of an Isosceles Triangle
|
Vertical Angle
|
(noun)
Either of two equal and opposite angles formed by the intersection of two straight lines. (www.google.com) |
Voronoi Diagram
|
(noun)
In mathematics, a Voronoi diagram is a way of dividing space into a number of regions. (en.wikipedia.org) |
W
X
Y
Z