Geometry Flashcards
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47 terms
Terms | Definitions |
|---|---|
 Square | 4 equal sides. 90 degree angles. |
| Rectangle | quadrilateral. 90 degree angles. |
| Quadrilateral |  4-sided polygon |
| Perimeter |  distance around a figure |
| Area |  number of square units it takes to cover a figure |
| Base |  bottom of a figure |
| Height |  the line that makes a 90 degree angle with the base |
| Right Angle |  90 degree angle |
| Triangle |  3-sided polygon |
| Acute Triangle |  3-sided polygon, each angle is less than 90 degrees |
| Obtuse triangle |  3-sided polygon, 1 angle greater than 90 degrees |
| Right Triangle |  3-sided polygon. One 90 degree angle. |
| Isosceles Triangle |  3-sided polygon. 2 congruent sides. |
| Equilateral Triangle |  3-sided polygon. 3 congruent sides. 3 60 degree angles. |
| Scalene Triangle |  3-sided polygon. No congruent sides |
| Leg |  the 2 sides that make the right angle in a right triangle |
| Hypotenuse |  side opposite the right angle in a right triangle |
| hypotenuse | side opposite the right angle in a right triangle |
| parallelogram |  4-sided quadrilateral. 2 pairs of parallel lines |
| parallel lines |  lines that will never intersect |
| trapezoid |  4-sided quadrilateral. 1 pair of parallel lines |
| congruent |  same size, same shape |
| rhombus |  4 equal-sided polygon |
| segment |  line between two points |
| vertex or vericies |  the point where 2 lines meet |
| polygon | many-sided figure, closed, straight line segment |
| regular polygon |  polygon with congruent sides and congruent angles |
| irregular polygon |  polygon without all congruent sides |
| straight angle |  angle measuring 180 degrees |
| circle |  infinite set of points equidistant from a centerpoint |
| radius |  half the diameter |
| diameter |  distance across a circle through the center point |
| pi |  ratio of circumference of a circle to its diameter, irrational; = 3.14 |
| circumference |  distance around a circle |
| semi-circle |  half of a circle |
| inscribed |  a figure drawn inside another |
| circumscribed |  a figure drawn within a circle |
| complementary angles |  angles whose sum equals 90 degrees |
| Supplementary angles |  angles whose sum equals 180 degrees |
| interior angle |  angles inside of a polygon |
| exterior angle |  angle made when you extend one of the sides of the polygon outside from the polygon |
| regular polygon | a polygon with congruent sides and congruent angles |
| pentagon |  5-sided polygon |
| hexagon |  6-sided polygon |
| heptagon |  7-sided polygon |
| octagon |  8-sided polygon |
| nonagon |  9-sided polygon |
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