These vocabulary words accompany chapter 8 of Addison Wesley Grade 3
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| edge | a line segment where two edges meet
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| face | each flat surface of a solid figure
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| corner | where three or more edges meet
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| vertex | where three or more edges meet
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| vertices | plural of vertex
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| point | an exact position
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| line | a set of points that is endless in both directions
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| line segment | part of a line that has two endpoints
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| ray | part of a line that is endless in one direction. It has only one end point
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| intersecting lines | lines that cross at one point
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| parallel lines | lines that never cross
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| angle | made by two rays that have the same endpoint. The endpoint is the vertex of the angle.
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| right angle | makes a square corner, is also called a ninety degree angle
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| acute angle | less than a right angle, less than a ninety degree angle
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| obtuse angle | greater than a right angle, greater than a ninety degree angle.
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| perpendicular lines | line segments or rays that form right angles
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| polygon | a closed figure made of straight line segments
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| triangle | a polygon with three sides
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| quadrilateral | a polygon with four sides
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| pentagon | a polygon with five sides
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| hexagon | a polygon with six sides
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| octagon | a polygon with eight sides
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| equilateral triangle | all sides of the triangle are the same length
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| isosceles triangle | at least two sides of this triangle are the same length
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| scalene triangle | no sides of this triangle are the same length
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| right triangle | one angle of this triangle is a right angle
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| obtuse triangle | one angle of this triangle is obtuse
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| rectangle | a polygon with four right angles - the opposites sides are the same length
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| parallelogram | the opposite sides of this polygon are parallel and the same length
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| square | this polygon has four right angles and all the sides are the same length
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| rhombus | the opposite sides of this polygon are parallel and all sides are the same length
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| trapezoid | this polygon has only one pair of parallel sides
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| symmetric | when two halves of a figure match
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| line of symmetry | the central fold line in a figure
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| perimeter | the distance around a figure, add the lengths of all sides.
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| area | the number of square units needed to cover the region inside of a figure
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| square unit | a square with sides that are each one unit long
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| volume | the number of cubic units needed to fill a solid figure
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| cubic unit | a cube with edges that are one unit long
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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