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G5: Unit 6
Geometry
| Term | Definition |
|---|---|
| acute angle | an angle less than 90 degrees |
| acute triangle | a triangle that contains only angles that are less than 90 degrees |
| angle | The amount of turn between two straight lines that have a common endpoint (the vertex). |
| circle | a round plane figure whose boundary (circumference) is equal distance from the center |
| classify | to put in a group based on similarities |
| degrees | a measure for angles |
| end point | a point at which a line segment or a ray ends. a line segment has 2 endpoints. a ray has one endpoint. |
| equilateral triangle | a triangle with equal sides and angles |
| hexagon | a plane figure with six sides and six angles |
| hierarchy | a system of things ranked one above another |
| intersect | to cross over at a common point |
| isosceles triangle | a triangle with 2 equal sides and angles |
| line | a line is a straight path that is endless in both directions |
| line segment | part of a line connecting two points. it has definite endpoints. |
| obtuse angle | an angle that is more than 90 degrees but less than 180 degrees |
| obtuse triangle | a triangle that has 1 angle greater than 90 degrees |
| octagon | a plane figure with eight straight sides and eight angles. |
| parallel lines | two lines on a plan that never meet - they are always the same distance apart |
| Parallelogram | A 4-sided shape with straight sides where opposite sides are parallel (opposite sides are equal in length and opposite angles are equal). |
| perpendicular lines | lines that intersect at right angles (90 degrees) to each other |
| plane figure | a two-dimensional shape with length and width, but no thickness |
| points | a exact location - points have no size, only position |
| polygon | A closed plane figure made up of 3 or more straight lines |
| Properties | characteristics used to describe a figure (length, width, edge, line segments, face, area, vertices, parallel, perpendicular...) |
| quadrilateral | a plane figure with four straight sides |
| ray | a line with a start point but no endpoint (it goes on forever) |
| rectangle | a parallelogram with four right angles, four straight sides, and opposite sides are parallel and equal in length |
| Rhombus | a parallelogram with straight, equal length sides. Opposite sides are parallel and opposite angles are equal. |
| right angle | an angle that measures exactly 90 degrees (square corner) |
| right triangle | a triangle with 1 right angle (90 degrees) |
| scalene triangle | a triangle with all sides and angles of different measure |
| square | a parallelogram with four right angles and four equal sides (a special type of rectangle) |
| three-dimensional | (3D) a shape that has three dimensions - length, width, and height |
| Trapezoid | A parallelogram with straight sides that has a pair of opposite sides parallel. |
| triangle | a plane figure with three sides and three angles |
| two-dimensional | (2D) a shape that only has two dimensions, length and width |
| vertex | a point where two or more straight lines meet (a corner). More than one vertex are called, vertices. |
Created by:
Mr. Shaun
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