math vocab cards
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Created by:
THOMASISCOOL on December 14, 2011
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Description:
math (geometry) vocab cards
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52 terms
Terms | Definitions |
|---|---|
 right angle | the 90 degree angle between two perpendicular lines |
| parallel lines | coplanar lines that do not intersect |
| intersecting lines | lines that cross at one point |
| nonagon | a nine-sided polygon |
| decagon | a polygon with 10 sides and 10 angles |
| isosceles triangle | a triangle with two equal sides |
| scalene triangle | a triangle with no two sides of equal length |
| radius | the length of a line segment between the center and circumference of a circle or sphere |
| central angle | an angle whose vertex is the center of the circle |
| translation | the act of uniform movement |
| reflection | a transformation in which the direction of one axis is reversed |
| line segment | part of a line with two endpoints |
| vertical angles | two angles whose sides form two pairs of opposite rays |
| perpindicular lines | lines that intersect to form right angles |
| dodecagon | a twelve-sided polygon |
| trapezoid | a quadrilateral with two parallel sides |
| arc | a continuous portion of a circle |
| glide reflection | a reflection that slides and flips |
| ray | a straight line extending from a point |
| supplementary angles | Two angles whose sum is 180 degrees |
| polygon | a closed plane figure bounded by straight sides |
| regular polygon | a polygon with all sides and all angles equal |
| parallelogram | a quadrilateral whose opposite sides are both parallel and equal in length |
| sector | a plane figure bounded by two radii and the included arc of a circle |
| rotation | a transformation in which the coordinate axes are rotated by a fixed angle about the origin |
| angle | the space between two lines or planes that intersect |
| complementary angles | two angles whose sum is a right angle |
| pentagon | a five-sided polygon |
| acute triangle | a triangle whose interior angles are all acute |
| rectangle | an irregular parallelogram with four right angles |
| chord | a straight line connecting two points on a circle |
| symmetry | an attribute of a shape or relation |
| vertex | the point of intersection of lines or the point opposite the base of a figure |
| adjacent angles | are a pair of angles with a common vertex and a common side, but no common interior points |
| hexagon | a six-sided polygon |
| obtuse triangle | a triangle that contains an obtuse interior angle |
| rhombus | a parallelogram with four equal sides but no right angles |
| diameter | the length of a straight line passing through the center of a circle and connecting two points on the circumference |
| reflection symmetry | A figure has reflection (line) symmetry with respect to a line iff it coincides with its reflection image through the line |
| plane | an unbounded two-dimensional shape |
| congruent angles | angles that have the same measure |
| heptagon | a seven-sided polygon |
| right triangle | a triangle with one right angle |
| square | (geometry) a plane rectangle with four equal sides and four right angles |
| congruent figures | figures that have the same size and shape |
| rotational symmetry | The ability of a figure to be rotated less than a full circle and exactly match its original image |
| acute angle | an angle less than 90 degrees but more than 0 degrees |
| midpoint | a point equidistant from the ends of a line or the extremities of a figure |
| octagon | an eight-sided polygon |
| equilateral triangle | a three-sided regular polygon |
| circle | a round plane shape |
| similar figures | figures that have the same shape but not the same size |
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