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19 Cards in this Set
- Front
- Back
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point
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an exact location that has no size
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line
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a straight path that has no thickness and extends forever
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plane
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a flat surface that has no thickness and extends forever
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line segment
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a part of a line made of two endpoints and all the points between them
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ray
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a part of a line that starts at an endpoint and extends forever in one direction
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angle
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formed by two rays with a common endpoint
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vertex
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the common endpoint of two rays
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acute angle
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measures greater than 0 degrees and less than 90
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right angle
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measures exactly 90 degrees
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obtuse angle
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measures greater than 90 degrees and less than 180 degrees
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straight angle
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measures exactly 180 degrees
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congruent angles
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angles that have the same measure
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vertical angles
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angles formed opposite eachother when two lines intersect
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adjacent angles
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angles that are side by side and have a common vertex and ray
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complementary angles
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two angles whose measure have a sum of 90 degrees
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supplementary angles
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two angles whose measures have a sum of 180 degrees
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parallel lines
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lines in the same plane that never intersect
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perpindicular lines
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intersect to form 90 degree angles, or right angles
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skew lines
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lines that lie in different planes; neither parallel or intersecting
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