Math-Geometry Terms Ch.7
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33 terms
Terms | Definitions |
|---|---|
 point | an exact location |
| line | a straight path that extends without end in opposite directions |
| Plane | a flat surface that extends without end in all directions |
| line segment | made up of two endpoints and all the points between |
| ray | has one endpoint and continues without end in other direction |
| angle | formed by two rays with a common endpoint |
| vertex | a common end poin of two rays |
| actute angle | an angle that measures less than 90 degrees |
| right angle | an angle the measures exactly 90 degrees |
| obtuse angle | an angle that measures greater then 90 degrees |
| straight angle | an angle that measures exactly 180 degrees |
| congruent | angles that have exactly the same measurement |
| vertical angles | angles that are formed oppostie of each other when two lines interesect. they are always congruent/equal. |
| adjacent angles | angles that are side by side and have a common vertex and ray |
| complimentary angles | two angles that add up to 90 degrees |
| supplementary angles | two angles that add up to 180 degrees |
| parallel lines | lines on the same plane that never intersect |
| perpendicular lines | lines that intersect at right angles or 90 degrees |
| acute triangle | a triangle with only acute angles |
| obtuse triangle | a triangle with one obtuse and two acute angles |
| right triangle | a triangle with one right angle and two acute angles |
| scalene triangle | a triangle with no congruent sides |
| isosceles triangle | a triangle with two congruent sides |
| equilateral triangle | a triangle with three congruent sides |
| quadrilateral | a plane figure with four sides and four angles |
| parallelogram | oppostie sides are parallel and congruent; opposite angles are congruent |
| rectangle | a parallelogram with four right angles opposite sides equal in length |
| rhombus | parallelogram with four congruent sides |
| square | a rectagle with four congruent sides |
| trapezoid | quadrilateral with exactly 2 parallel sides |
| polygon | a closed plane figure formed by three or more line segments |
| regular polygon | a polygon in which all sides are congruent and all angles are congruent |
| line of symmetry | a figure can be folded in half and the two parts are equal or match |
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