geometry
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| acute angle | an angle with a measure greater than 0 degrees and less than 90 degrees
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| adjacent angles | angles that share an common ray and have the same origin
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| angle | a geometric figure formed by two rays joined at their origins
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| bisect | to divide into two equal parts
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| bisector | a line or line segment that divides another figure into two equal parts
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| collinear | lying on the same line
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| complementary angles | two angles with measures that add up to 90 degrees
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| congruent | having exactly the same size and shape
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| coplanar | lying in the same plane
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| degree | a unit of measure for angles; 1/360th of a circle
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| empty set | a set having no elements; also called a null set
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| infinite | without end; unable to be counted or measured
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| interior angle | angle within a polygon; angle within two parallel lines that are crossed by a transversal
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| line | in geometry, a set of connected points that extends infinitely in two directions
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| line segment | a section of a line bounded by two endpoints
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| midpoint | the point exactly in the center of a line segment
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| null set | a set having no elements; also called empty set
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| obtuse angle | an angle with a measure greater than 90 degrees and less than 180 degrees
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| origin | the endpoint of a ray; on a coordinate grid, the point at the intersection of the axes, generally identified by the ordered pair
( 0, 0 )
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| parallel lines | lines in the same plane that do not intersect
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| perpendicular lines | lines that form right angles when they intersect
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| perpendicular bisector | a line or line segment that is perpendicular to another line segment through its midpoint
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| pi | the Greek letter, which represents an irrational number with an approximate value of 22/7 or 3.14
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| plane | a flat, two dimensional surface that extends infinitely in all directions
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| plane geometry | the study of figures that all lie in one plane
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| point | a defined position in space that has no dimension; represented with a dot
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| protractor | a device used to measure the number of degrees in an angle
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| ray | a geometric figure that starts at a definite point (called the origin)
and extends infinitely in one direction
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| reflex angle | an angle that has a measure between 180 degrees and 360 degrees
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| right angle | an angle measuring 90 degrees
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| set | a collection of items
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| straight angle | an angle with an measure of 180 degrees
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| subset | a part of a given set
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| supplementary angles | two angles with measures that add up to 180 degrees
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| union | the combined elements from two or more sets
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| vertex | the endpoint shared by two rays, line segments, or edges; plural is verticles
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| vertical angles | the angles opposite each other when two lines intersect
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| circle | a set of points an equal distance from the center
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| radius | the distance from the center to the edge
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| chord | intercepts the circle
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| circumstance | the perimeter of circle
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| oval/ellipse | a stretched circle
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| diameter | measures through
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| secant | where a line goes through at a couple points
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| sector | a piece of the area of the circle
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| edge | the lines where the faces of a rectangular solid meet
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| cubed units | the volume of a geometric solid
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| vertices | the edges of a rectangular solid meet in points called
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| circle | the base of a cylinder is a
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| face | the flat surface of an rectangular solid
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| cylinder | geometric solid with a circular base and sides perpendicular to the base
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| altitude | height of a triangle
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| vertex | the endpoint shared by two rays, line segments, or edges.
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| slant height | the height of a triangle forming a face of a pyramid
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| faces | one of the flat surfaces of a solid
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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.
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To hide a column, click on the column name.
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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.
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