A
Adjacent Interior Angles (noun)
Any two interior angles that share a common side are called the "adjacent interior angles" of the polygon, or just "adjacent angles". |
Alternate Angles (noun)
Two angles, not adjoining one another, that are formed on opposite sides of a line that intersects two other lines. If the original two lines are parallel, the alternate angles are equal. https://www.google.com/search?q=what+are+corresponding+%5C&oq=what+are+corresponding+%5C&aqs=chrome.0.57l2j0l2j62.7447j0&sourceid=chrome&ie=UTF-8#q=what+are+alternate+angles |
Arc Measure (verb)
The messuring of arcs in degrees. http://ceemrr.com/Geometry2/Arc_Measure/Arc_Measure_print.html |
Acute Angle (noun)
A triangle whose interior angles are all acute. https://www.google.com/#q=what+is+an+acute+triangle |
B
Base (noun)
In geometry, a base is a side of a plane figure or face of a solid, particularly one perpendicular to the direction height is measured or on what is considered to the bottom of the object. This usage can be applied to a triangle, parallelogram, trapezoids, cylinder, cone, pyramid, parallelopiped or frustum. |
Base angles of a isosceles triangle (noun)
An isosceles triangle has two congruent sides called legs and a third side called the base. |
C
Compass (noun)
An instrument containing a magnetized pointer that shows the direction of magnetic north and bearings from it. https://www.google.com/search?um=1&hl=en&q=circumcenter&bav=on.2,or.r_qf.&bvm=bv.54934254,d.cGE,pv.xjs.s.en_US.O2lQuQLBa4Q.O&biw=1280&bih=615&dpr=1&ie=UTF-8&sa=N&tab=iw&ei=a-FiUv3SJ6WZiALVkIG4Aw#hl=en&q=what+is+a+compass |
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. https://www.google.com/search?um=1&hl=en&q=circumcenter&bav=on.2,or.r_qf.&bvm=bv.54934254,d.cGE,pv.xjs.s.en_US.O2lQuQLBa4Q.O&biw=1280&bih=615&dpr=1&ie=UTF-8&sa=N&tab=iw&ei=a-FiUv3SJ6WZiALVkIG4Aw#hl=en&q=what+is+a+circumcenter |
Congruent (adjective)
(of figures) identical in form; coinciding exactly when superimposed. https://www.google.com/search?hl=en&q=coincide&bav=on.2,or.r_qf.&bvm=bv.54934254,d.cGE,pv.xjs.s.en_US.O2lQuQLBa4Q.O&biw=1280&bih=615&dpr=1&ie=UTF-8&sa=N&tab=iw&ei=bt9iUvOzEserjAK8toCYCA#hl=en&q=congruent |
Converse (noun)
In geometry, the term converse refers to parts of an equation that have been switched. |
Coincide (verb)
Occur at or during the same time. https://www.google.com/search?hl=en&q=coincide&bav=on.2,or.r_qf.&bvm=bv.54934254,d.cGE,pv.xjs.s.en_US.O2lQuQLBa4Q.O&biw=1280&bih=615&dpr=1&ie=UTF-8&sa=N&tab=iw&ei=bt9iUvOzEserjAK8toCYCA |
Construct (verb)
Build or erect (something, typically a building, road, or machine) https://www.google.com/search?q=what%20does%20construct%20mean&bav=on.2,or.r_qf.&bvm=bv.54934254,d.cGE,pv.xjs.s.en_US.O2lQuQLBa4Q.O&biw=1280&bih=615&dpr=1&ie=UTF-8&hl=en&sa=N&tab=iw&ei=RdtiUpqnAcWdigKIgIGYCw |
Counterexample (noun)
Refutation by example https://www.google.com/#q=What+is+counterexample |
Complementary Angle (noun)
Either of two angles whose sum is 90 degrees. https://www.google.com/#q=what+is+a+complementary+angle |
Corresponding Angels (noun)
The angles that occupy the same relative position at each intersection where a straight line crosses two others. If the two lines are parallel, the corresponding angles are equal. https://www.google.com/search?q=what+are+corresponding+%5C&oq=what+are+corresponding+%5C&aqs=chrome.0.57l2j0l2j62.7447j0&sourceid=chrome&ie=UTF-8#q=what+are+corresponding+angles |
Cylinder (noun)
A solid geometric figure with straight parallel sides and a circular or oval section. https://www.google.com/#q=what+is+a+cyllander |
Cube (noun)
A symmetrical three-dimensional shape, either solid or hollow, contained by six equal squares. https://www.google.com/#q=what+is++cubhe |
Chord (noun)
A chord of a circle is a geometric line segment whose endpoints both lie on the circumference of the circle. A secant or a secant line is the line extension of a chord. https://www.google.com/#q=What+is+a+chord+geometry |
Concentric (adjective)
Of or denoting circles, arcs, or other shapes that share the same center, the larger often completely surrounding the smaller. https://www.google.com/#q=What+is+concentric |
Cone (noun)
A solid or hollow object that tapers from a circular or roughly circular base to a point. https://www.google.com/#q=what+is+cone |
Central angle (noun)
A central angle is an angle whose vertex is the center of a circle, and whose sides pass through a pair of points on the circle, thereby subtending an arc between those two points whose angle is (by definition) equal to that of the central angle itself. http://en.wikipedia.org/wiki/Central_angle D |
Degrees (noun)
A unit of measurement of angles, one three-hundred-and-sixtieth of the circumference of a circle. |
Diameter (noun)
A straight line passing from side to side through the center of a body or figure, esp. a circle or sphere. https://www.google.com/#q=What+is+a+diameter |
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HL (noun)
Two right triangles are congruent if the hypotenuse and one corresponding leg are equal in both triangles. |
I
Included Angle (noun)
An included angle is one which is made by two lines that have a common vertex. The angle that is made at the meeting point of these two lines is what is referred to as an included angle and the term included is used to mean that the angles is found between these two lines. |
Isosceles Triangle (noun)
A triangle with two equal sides. http://wordnetweb.princeton.edu/perl/webwn?s=isosceles%20triangle |
J
K
Kite (noun)
A quadrilateral figure having two pairs of equal adjacent sides, symmetrical only about its diagonals. https://www.google.com/#q=what+is+a+kite |
L
Line (noun)
The flow or run of a point which will leave from its imaginary moving some vestige in length, exempt of any width. (http://en.wikipedia.org/wiki/Line_(geometry)) |
Linear Pair (noun)
The two supplementary adjacent angles formed by two intersecting lines. http://wordnetweb.princeton.edu/perl/webwn?s=vertical%20angle |
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O
Octahedron (noun)
A three-dimensional shape having eight plane faces, esp. a regular solid figure with eight equal triangular faces. https://www.google.com/#q=what+is+an+octohedron |
Obtuse Triangle (noun)
A triangle that contains an obtuse interior angle. https://www.google.com/#q=what+is+an+obtuse+triangle |
P
Protractor (noun)An instrument for measuring angles, typically in the form of a flat semicircle marked with degrees along the curved edge.
https://www.google.com/search?um=1&hl=en&q=circumcenter&bav=on.2,or.r_qf.&bvm=bv.54934254,d.cGE,pv.xjs.s.en_US.O2lQuQLBa4Q.O&biw=1280&bih=615&dpr=1&ie=UTF-8&sa=N&tab=iw&ei=a-FiUv3SJ6WZiALVkIG4Aw#hl=en&q=what+is+a+protractor |
Point (noun)
A primitive notion upon which other concepts may be defined. They are zero-dimentional, and have no volume, area, or length. (http://en.wikipedia.org/wiki/Point_(geometry)) |
Plane (noun)
A flat, two-dimentional surface. It is a two dimentional analogue of a point, a line, and a solid. (http://en.wikipedia.org/wiki/Plane_(geometry)) |
Prism (noun)
A solid geometric figure whose two end faces are similar, equal, and parallel rectilinear figures, and whose sides are parallelograms. https://www.google.com/#q=what+is+a+prism |
Parallelogram (noun)
A four-sided plane rectilinear figure with opposite sides parallel. https://www.google.com/#q=what+is+a+parallelogram |
Polygon (noun)
A plain figure with at least three straight sides and angles, and typically five or more. https://www.google.com/#q=what+is+a+polygon |
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R
Remote Interior Angles (noun)The remote interior angles are the two angles inside the triangle that do not share a vertex with the exterior angle.
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"Regular" Polygon (noun)
A polygon where all sides and angels are equal. http://wordnetweb.princeton.edu/perl/webwn?s=regular%20polygon |
Rhombus (noun)
A parallelogram with opposite equal acute angles, opposite equal obtuse angles, and four equal sides. https://www.google.com/#q=what+is+a+rhombus |
Rectangle (noun)
A plane figure with four straight sides and four right angles, esp. one with unequal adjacent sides, in contrast to a square. https://www.google.com/#q=what+is+a+rectangle |
S
Similar (adj.)Two polygons are similar polygons if corresponding angles have the same measure and corresponding sides are in proportion.
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SSS (noun)
The side-side-side (SSS) congruence states that if the three sides of one triangle have the same lengths as the three sides of another triangle, then the two triangles are congruent. |
SAS (noun)
The side-angle-side (SAS) similarity test says that if two triangles have two pairs of sides that are proportional and the included angles are congruent, then the triangles are similar. |
SSA (noun)
The SSA condition (Side-Side-Angle) which specifies two sides and a non-included angle (also known as ASS, or Angle-Side-Side) does not by itself prove congruence. In order to show congruence, additional information is required such as the measure of the corresponding angles and in some cases the lengths of the two pairs of corresponding sides. |
Straightedge (N):
An idealized mathematical object having a rigorously straight edge which can be used to draw a line segment. |
Supplementary Angle (noun)
Either of two angles whose sum is 180 degrees. https://www.google.com/#q=What+is+a+supplementary+angle |
Sphere (noun)
A round solid figure, or its surface, with every point on its surface equidistant from its center. https://www.google.com/#q=what+is+a+sphere |
Scalene Triangle (noun)
A triangle with no two sides of equal length. http://wordnetweb.princeton.edu/perl/webwn?s=scalene%20triangle |
Square (noun)
a plane figure with four equal straight sides and four right angles. https://www.google.com/#q=what+is+a+square |
T
Triangle Inequality (verb)In mathematics, the triangle inequality states that for any triangle, the sum of the lengths of any two sides must be greater than the length of the remaining side. In Euclidean geometry and some other geometries the triangle inequality is a theorem about distances.
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Trapeziod (noun)
A quadrilateral with only one pair of parallel sides. https://www.google.com/#q=what+is+a+trapeziod |
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V
Vertex angle of an isosceles triangle (noun)In an isosceles triangle, the angle formed by the two legs of equal length. The vertex angle is always opposite the base.
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Vertex (noun)
A special kind of point that describes the corners or intersections of geometric shapes. (http://en.wikipedia.org/wiki/Vertex_(geometry)) |
Vertical Angle (noun)
Either of two equal and oppisite angles formed by the intersection of two straight lines. http://wordnetweb.princeton.edu/perl/webwn?s=vertical%20angle |
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Any definitions without links are from: http://www.mathsisfun.com/