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21 Cards in this Set
- Front
- Back
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Point |
Basic unit of geometry |
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Line |
straight arrangement of points that extends forever in 2 directions |
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plane |
flat surface that extends forever in 4 directions |
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collinear points |
2 or more points in a straight line |
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coplanar points |
3 or more points on the same plane |
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space |
set of all points |
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line segment |
measurable part of a line - has 2 endpoints |
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ray |
part of a line that has 1 endpoint |
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angle |
2 common rays that share an endpoint |
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vertex |
common endpoint of an angle |
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midpoint |
point on a segment that divides the segment into 2 equal parts |
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protractor |
tool used to measure the number of degrees in an angle |
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congruent |
two figures that have the same size and shape |
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right angle |
angle that measures 90 degrees |
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acute angle |
angle that measure between 0 and 90 degrees |
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obtuse angle |
angle that measures between 90 and 180 degrees |
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complementary angles |
angles whose measure adds to 90 degrees |
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supplementary angles |
angles whose measure adds to 180 degrees |
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vertical angles |
each of the pairs of opposite angles made by two intersecting lines |
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adjacent angles |
two angles that have a common vertex and a common side |
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linear pair |
a pair of adjacent, supplementary angles. |
