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Solid Math Vocab
These vocabulary words accompany chapter 8 of Addison Wesley Grade 3
| Question | Answer |
|---|---|
| edge | a line segment where two edges meet |
| face | each flat surface of a solid figure |
| corner | where three or more edges meet |
| vertex | where three or more edges meet |
| vertices | plural of vertex |
| point | an exact position |
| line | a set of points that is endless in both directions |
| line segment | part of a line that has two endpoints |
| ray | part of a line that is endless in one direction. It has only one end point |
| intersecting lines | lines that cross at one point |
| parallel lines | lines that never cross |
| angle | made by two rays that have the same endpoint. The endpoint is the vertex of the angle. |
| right angle | makes a square corner, is also called a ninety degree angle |
| acute angle | less than a right angle, less than a ninety degree angle |
| obtuse angle | greater than a right angle, greater than a ninety degree angle. |
| perpendicular lines | line segments or rays that form right angles |
| polygon | a closed figure made of straight line segments |
| triangle | a polygon with three sides |
| quadrilateral | a polygon with four sides |
| pentagon | a polygon with five sides |
| hexagon | a polygon with six sides |
| octagon | a polygon with eight sides |
| equilateral triangle | all sides of the triangle are the same length |
| isosceles triangle | at least two sides of this triangle are the same length |
| scalene triangle | no sides of this triangle are the same length |
| right triangle | one angle of this triangle is a right angle |
| obtuse triangle | one angle of this triangle is obtuse |
| rectangle | a polygon with four right angles - the opposites sides are the same length |
| parallelogram | the opposite sides of this polygon are parallel and the same length |
| square | this polygon has four right angles and all the sides are the same length |
| rhombus | the opposite sides of this polygon are parallel and all sides are the same length |
| trapezoid | this polygon has only one pair of parallel sides |
| symmetric | when two halves of a figure match |
| line of symmetry | the central fold line in a figure |
| perimeter | the distance around a figure, add the lengths of all sides. |
| area | the number of square units needed to cover the region inside of a figure |
| square unit | a square with sides that are each one unit long |
| volume | the number of cubic units needed to fill a solid figure |
| cubic unit | a cube with edges that are one unit long |
Created by:
angiebriotta@gmail.c
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