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6th Math 3rd 9 wks.
vocabulary for RISD's 3rd 9 weeks
| vocabulary word | definition |
|---|---|
| line | a straight path that extends infinitely in opposite directions |
| line segment | a part of a line with 2 endpoints |
| midpoint | the point on a line segment that divides it into 2 congruent parts |
| ray | a part of a line that has one endpoint and extends forever in the opposite direction |
| intersecting lines | two lines that cross at exactly one point |
| perpendicular lines | lines that intersect at one point and form right angles |
| parallel lines | two lines in the same plane that never intersect |
| skew lines | lines that lie in different planes and are neither parallel nor intersecting |
| right angle | an angle with a measure of 90 degrees |
| obtuse angle | an angle with a measure of more than 90 degrees but less than 180 degrees |
| acute angle | an angle that measures greater than 0 degrees and less than 90 degrees |
| adjacent angles | angles that share a common ray, have a common vertex and do not overlap |
| vertical angles | a pair of opposite congruent angles formed by intersecting lines |
| vertex/vertices | the point where 2 rays meet, where 2 sides of a polygon meet, or where the edges of a 3-dimensional shape meet; the top point of a cone or pyramid |
| straight angle | an angle whose measure is 180 degrees |
| right triangle | a triangle with one right angle |
| obtuse triangle | a triangle with one obtuse angle |
| acute triangle | a triangle with 3 acute angles |
| scalene triangle | a triangle with no congruent sides |
| equilateral triangle | a triangle with 3 equal sides |
| isosceles triangle | a triangle with two congruent sides |
| congruent | having the same shape and the same size |
| symmetry | a figure has line symmetry if a line can divide the figure into 2 congruent parts |
| transformation | a change in size, shape, or position of a geometric figure |
| reflection | a transformation that produces a mirror image of a geometric figure (flip) |
| translation | a transformation that moves a geometric figure by sliding each of the points the same distance in the same direction (slide) |
| rotation | a transformation of a figure by turning it about a fixed point (turn) |
| quadrilateral | a four sided polygon |
| pentagon | a five sided polygon |
| hexagon | a six sided polygon |
| octagon | an eight sided polygon |
| decagon | a ten sided polygon |
| rhombus | a parallelogram whose 4 sides are congruent and whose opposite angles are congruent |
| parallelogram | a quadrilateral with opposite sides parallel and congruent |
| trapezoid | a quadrilateral that only has one pair of parallel sides |
| polygon | a closed figure made of line segments |
| regular polygon | a polygon in which all sides are the same length and all angles have the same measure |
| prism | a 3 dimensional shape with 2 parallel, congruent bases; all other faces are parallelograms |
| cylinder | a 3 dimensional figure with 2 parallel bases that are congruent circles |
| sphere | a 3 dimensional shape with all points an equal distance from the center |
| cone | a 3 dimensional shape with a circular base, a curved surface, and one vertex |
| face | a flat surface of a 3 dimensional shape |
| edge | the line segment where 2 faces of a 3 dimensional shape meet |
| customary system of measurement | the measurement system used most often in the United States |
| Metric System of Measurement | a measurement system used throughout the world based on multiples of 10 |
| gram | a standard unit for measuring mass (weight) in the metric system |
| liter | a metric system of measurement for capacity |
| meter | a metric system unit for measuring distance |
| capacity | a measure of liquid a container will hold |
| degree | a unit of measure for angles and for temperature |
| area | the number of square units needed to cover a surface (all of the inside of a shape) |
| perimeter | the distance around a 2 dimensional shape |
| Pi | the ratio of the circumference of a circle to its diameter |
| circumference | the distance around a circle |
| radius | a line segment from the center of a circle to any point on the circle |
| central angle | an angle that has its vertex at the center of a circle |
| chord | a line segment whose endpoints are on the circle |
| volume | the number of cubic units needed to fill the space occupied by a solid |
| diameter | a line segment that passes through the center of a circle and has endpoints on the circle |
| cubic units | what volume is measured in |
Created by:
ltimmermann
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