Math Vocab Words- Chapter 8
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Created by:
voolevoonye on February 4, 2012
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33 terms
Terms | Definitions |
|---|---|
 angle | figure formed by two rays with a common endpoint |
| vertex | common endpoint of two rays |
| acute angle | angle measure of less than 90 degrees |
| right angle | the 90 degree angle between two perpendicular lines |
| obtuse angle | An angle that measures more than 90 degrees but less than 180 degrees |
| straight angle | an angle of 180 degrees |
| congruent | Having the same size, shape, and measure |
| vertical angle | either of two equal and opposite angles formed by the intersection of two straight lines |
| adjacent angle | 2 angles that have the same vertex and a common ray but no interior points in common |
| complementary angle | two angles that add up to 90 degrees |
| supplementary angle | two angles whose measures have a sum of 180 degrees |
| point | an exact location |
| line | a straight path that goes on forever in both directions |
| plane | a flat surface that extends without end in all directions |
| line segment | part of a line with two endpoints |
| ray | a straight line extending from a point that goes on forever in one direction |
| parallel lines | Lines in the same plane that do not intersect |
| perpendicular lines | Two lines that intersect to form right angles |
| skew lines | lines that lie in different planes. they are neither parallel or intersecting |
| acute triangle | a triangle that has three acute angles |
| obtuse triangle | a triangle with one obtuse angle |
| right triangle | a triangle with one right angle |
| quadrilateral | a plane figure with 4 sides and 4 angles |
| parallelogram | a quadrilateral whose opposite sides are both parallel and equal in length |
| rectangle | a parallelogram with four right angles |
| rhombus | a parallelogram with 4 congruent sides |
| square | a rectangle with four equal sides and four right angles |
| trapezoid | a quadrilateral with two parallel sides |
| line symmetry | a property that a shape can have. means that when you fold the figure in half , the 2 halves match exactly. |
| line of symmetry | a line that divides a figure into 2 halves that match exactly when the figure is folded on that line |
| equilateral triangle | a triangle with three equal sides |
| isosceles triangle | a triangle with two congruent sides |
| scalene triangle | a triangle with no congruent sides |
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