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Geometry
Vocabulary
| Term | Definition |
|---|---|
| Geometry | the study of points, lines, angles, surfaces, and solids. |
| Point | a location in space |
| line | a collection of points that extend forever in the same direction |
| line segment | part of a line, 2 endpoints |
| ray | a line that has a beginning point but no end |
| angle | two rays with the same endpoint |
| vertex | the point where two rays meet |
| plane | a flat surface that extends forever in all directions |
| parallel lines | lines that are always the same distance apart |
| intersecting lines | lines that cross in the same plane |
| perpendicular lines | intersecting lines that cross and form four right angles |
| acute angle | less than 90 degress |
| right angle | 90 degrees |
| obtuse angle | greater than 90 but less than 180 degrees |
| straight angle | 180 degrees |
| reflex angle | between 180 and 360 degrees |
| supplementary angles | 2 angles that measure 180 degrees |
| complementary angles | 2 angles that measure 90 degress |
| polygon | a closed plane figure with 3 or more sides |
| triangle | 3 sides |
| quadrilateral | 4 sides |
| pentagon | 5 sides |
| hexagon | 6 sides |
| heptagon | 7 sides |
| octagon | 8 sides |
| nonagon | 9 sides |
| decagon | 10 sides |
| dodecagon | 12 sides |
| Right Triangle | one 90 degree angle |
| Obtuse Triangle | one angle more than 90 degrees |
| Acute Triangle | all angles are less than 90 degrees |
| Scalene Triangle | no sides equal and no equal angles |
| Isosceles Triangle | 2 sides equaland 2 equal angles |
| Equilateral Triangle | 3 sides equal and 3 angles that are 60 degrees each |
| Square | 4 equal sides and 4 right angles |
| Rectangle | 4 right angles and the opposite sides are equal |
| Rhombus | 4 equal sides and the opposite angles are equal |
| Parallelogram | 2 pairs of equal and parallel sides |
| Trapezoid | one pair of parallel sides and one pair of sides that are not parallel |
| sum of the measure of the interior angles of triangle | 180 degrees |
| Perimeter | shortest distance around the outside of a polygon |
| Perimeter Formula | add up all the sides |
| Area | number of square units needed to cover a surface |
| Altitude | height of a polygon |
| Area of a Square | base x height |
| Area of a Rectangle | base x height |
| Area of a Parallelogram | base x height |
| Area of a Triangle | 1/2 base x height |
| Area of a Trapezoid | 1/2 x h x(base 1 + base 2) |
Created by:
ppearson
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