Eisenberg Vocabulary
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Created by:
ktlovesbks on October 1, 2009
Subjects:
Description:
includes points, lines, rays, angles, polygons, triangles, quadrilaterals, circles
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90 terms
Terms | Definitions |
|---|---|
 point | has no size, only location |
| line | straight, continous arrangement of infinitely many points; has no thickness; one-dimensional |
| plane | flat surface; two-dimensional; surface extends indinitely along its length and width; a plane is named with script capital letter |
| collinear | points that lie along the same line |
| coplainar | points that lie within the same plane |
| line segment | consists of two points called the endpoints of the segment and all the points between them that are collinear with the two points |
| congruent segments | segments that are equal in measure or length |
| midpoint | the point on the segment that is the same distance from both endpoints. A pair of hatch marks refer to line segments being the same length |
| bisects- | to cut in half |
| ray | begins at a point and extends infinitely in one direction |
| angle | formed by two rays that share a common endpoint |
| vertex | the common endpoint of the two rays of the angle |
| sides | the rays of an angle |
| measure of an angle | the smallest amount of rotation about the vertex from one ray to the other |
| degrees | unit of measurement for an angle |
| protractor | a geometry tool used to measure angles |
| congruent angles- | angles that are equal in measure |
| angle bisector | a ray that divides the angle into two congruent angles |
| parallel lines | lines that do not intersect and are part of the same plane |
| perpendicular lines | lines that do intersect and form a right angle |
| skew lines | lines that are neither parallel nor do they intersect (for 3-D setting) |
| right angle | an angle that measures 90 degrees |
| acute angle | an angle that measures less than 90 degrees |
| obtuse angle | an angle that measures more that 90 degrees |
| pair of vertical angles | angles that are formed by two intersecting lines; they share a common vertex but not a common side |
| linear pair of angles | two angles are a ____if they share a vertex and a common side and their non-common sides form a line |
| complementary angles | angles that form a right angle |
| supplementary angles | angles that sum up to 180 degrees |
| polygon | closed figure in a plane, formed by connecting line segments endpoint to endpoint with each segment intersecting the other |
| consecutive vertices | vertices that are adjacent to one another |
| consecutive angles | angles that are adjacent to one another |
| diangonal | a line segment that connects any two nonconsecutive vertices |
| concave polygon | a polygon that has at least one diagonal on the outside |
| convex polygon | a polygon that has no diagonals on the outside |
| congruent polygons | polygons that have exactly the same size and shape |
| equilateral polygons | a polygon who's sides are all equal |
| equilangular polygon | a polygon whose angles are all equal |
| regular polygon | a polygon whose sides and angles are all equal |
| triangle | 3 sides |
| quadrilateral | 4 sides |
| pentagon | 5 sides |
| hexagon | 6 sides |
| heptagon | 7 sides |
| octagon | 8 sides |
| nonagon | 9 sides |
| decagon | 10 sides |
| enneagon | 11 sides |
| dodecagon | 12 sides |
| triskaidecagon | 13 sides |
| tetrakaidecagon | 14 sides |
| pentakaidecagon | 15 sides |
| hexakaidecagon | 16 sides |
| heptakaidecagon | 17 sides |
| octakaidecagon | 18 sides |
| nonakaidecagon | 19 sides |
| icosagon | 20 sides |
| icosakaihenadecagon | 21 sides |
| triacontagon | 30 sides |
| hectagon | 100 sides |
| chiliagon | 1000 sides (chilagon?) |
| myriagon | 10000 sides |
| acute triangle | all angles are less than 90 degrees |
| obtuse triangle | one angle is more than 90 degrees and less than 180 degrees of a three sided polygon |
| right triangle | one angle is exactly 90 degrees |
| scalene triangle | no two sides are congruent of a three sided polygon |
| isosceles triangle | at least two sides are congruent of a three sided polygon |
| equilateral triangle | all sides are congruent of a three sided polygon |
| trapazoid | a quadrilateral with exactly one pair of parallel sides |
| isosceles trapazoid | top and bottom are parallel, two sides are congruent, top two angles are congruent, bottom two angles are congruent |
| right trapazoid | two right angles |
| kite | a quadrilateral with two pairs of consecutive congruent sides. The diagonails are perpendicular |
| parallelogram | a quadrilateral with two pairs of parallel sides |
| rhombus | an equilateral parallelogram |
| rectangle | a parallelogram with four congruent angles (right angles); an equilateral parallelogram |
| square | an equilateral, equilangular parallelogram; a regular quadrilateral; an equalateral rectangle |
| circle | a set of all points in a plane that are the same distance from a given point (center) in a plane |
| radius | a line segment from the center point of a circle to a point on the edge of a circle |
| diameter | a line segment passing through the center point of a circle and whose endpoints are on the edge of the circle |
| chord | any line segment whose endpoints are on the edge of a circle; the diameter is the longest chord |
| congruent circles | circles that have the same radius length |
| concentric circles | circles that share the same center point |
| arc of a circle | the continuous (unbroken) part of a circle that is in between two points on the edge of a circle |
| semicircle | arc of a circle whose endpoints are the endpoints of the diameter |
| minor arc | an arc of a circle that is smaller than a semicircle |
| major arc | an arc of a circle that is larger than a semicircle |
| arc measure | the measure of the central angle (in degrees) |
| central angle | angle formed by two radii and whose vertex is the center point of a circle |
| tangent | a line that intersects the circle at exactly one point |
| secant | a line that intersects the circle at exactly two points |
| inscribe angle | angle whose vertex is the point on a circle; the sides of this angle are the chords of the circle |
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