Flashcards: Geometry Terms
About these flashcards
Created by:
nicolemagnus on September 30, 2010
Subjects:
Description:
Geometry terms, triangles/ angles
Groups:
7hills grade 8 geometry, 5P Math- Clow, math, Geometry
Log in to favorite or report as inappropriate.All 87 terms
Terms | Definitions |
|---|---|
 rhombus | quadrilateral with all four sides congruent |
| acute triangle | a triangle with all three angles less than 90 degrees |
| square | regular quadrilateral |
| isosceles triangle | triangle with two equal sides |
| perimeter | sum of the lengths of the sides |
| obtuse triangle | traingle with one angle more than 90 degrees |
| kite | quadrilateral that has two pairs of adjacent sides the same length |
| diagonal | a line segment connecting non-adjacent vertices of a polygon |
| convex | every line segment connecting interior points that is entirely contained with the figure's interior |
| parallelogram | quadrilateral that has two pairs of opposite sides that are parallel |
| right triangle | triangle with one right (90 degree) angle |
| rectangle | quadrilateral with four right angles |
| trapezoid | quadrilateral that has one pair of opposite sides that are parallel |
| equilateral triangle | traingle with three equal sides |
| polygon | a closed plane figure for which all sides are line segments |
| scalene triangle | traingle with all three sides unequal |
| concave | a shape or solid which has a "cave" in it |
| congruent | same size and shape |
| equiangular polygon | All of the angles equal each other |
| regular polygon | All the sides and angles are the same |
| vertex angle | Point at which two line segments intersect (forming an angle) |
| base | congruent angles sharing a vertex |
| vertex | The rays of an angle are also known as this |
| equilateral polygon | All the sides equal each other |
| base angle | the angle opposite one of the equilateral sides in an isoscoles triangle |
| colinear | points on the same line |
| bisect | a ray that divides an angle in half |
| midpoint | the center point of the line |
| endpoint | a point that ends a line |
| degree | A unit of measure for angles and arcs equivalent to 1/360 of a rotation around a circle. |
| supplementary angle | two angles with a sum of 180 degrees |
| complementary angle | two angles with a sum of 90 degrees |
| right angle | the 90 degree angle |
| obtuse angle | An angle that measures more than 90 degrees but less than 180 degrees |
| acute angle | an angle less than 90 degrees but more than 0 degrees |
| linear pair | two angles that share a vertex and a common side |
| consecutive | one after the other, interior angles are supplementary |
| quadrilateral | a four-sided polygon |
| rhombus | a parallelogram with 4 congruent sides |
| hexagon | a polygon with 6 sides |
| pentagon | a five-sided polygon |
| octagon | A polygon with 8 sides |
| parallel | Lines that stay the same distance apart and never meet. |
| perpendicular | intersecting at or forming right angles |
| point | to indicate a location on a line or plane |
| line | a straight, continuous arrangement of many points |
| plane | a flat surface that extends infinitely in all directions |
| coplanar | points on the same plane |
| line segment | a line with two endpoints |
| ray | an endpoint with a continuous line of infinite points |
| angle | two noncollinear rays having a common endpoint |
| sides | congruent angles sharing a vertex |
| segment addition postulate | AB + BC = AC |
| angle addition postulate | <ABD + <DBC = <ABC |
| consecutive angles | angles that share one side in common |
| consecutive vertices | in a polygon two vertices that are endpoints of the same line |
| consecutive sides | sides in a polygon that are connected by a vertex |
| corresponding | agreeing in amount, magnitude, or degree |
| equilateral | all sides are congruent |
| equiangular | having all angles equal |
| regular | angles and sides are congruent |
| angle bisector | Cuts in half |
| leg | a side of a right triangle that include the 90 degree angle |
| assumption | ... |
| statement | a message that is stated or declared |
| reason | think logically |
| given | ... |
| reflexive | every triangle is congruent to itself |
| polyhedra | A three dimensional shape with flat surfaces, no holes, straight edges |
| tetrahedron | composed of four equilateral triangles, each three of which meet in a point |
| cube | a three-dimensional shape with six square or rectangular sides |
| octahedron | an eight-sided solid figure |
| icosahedron | a regular polyhedron with 20 triangular faces is called a(n) |
| irregular polyhedra | polygons that are composed of elements that are not all equal. |
| face | a polygonal region of a surface |
| side | congruent angles sharing a vertex |
| edge | a segment that helps to make up a face |
| vertical angles | are congruent and are equal to each other |
| heptagon | polygon with 7 sides |
| nonagon | polygon with 9 sides |
| decagon | polygon with 10 sides |
| dodecagon | polygon with 12 sides |
| transversal | line that intersects two or more other coplanar lines |
| alternate interior angles | angles between 2 lines and on opposite sides of a transversal |
| alternate exterior angles | Angles that lie outside a pair of lines and on opposite sides of a transversal. |
| corresponding angles | angles in the same place on different lines |
| perpendicular bisector | A line that is perpendicular to a segment at its midpoint. |