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Geometry Vocabulary
Question | Answer |
---|---|
Acute angle | measures less than 90 degrees |
Obtuse | measures more than 90 degrees and less than 180 degrees |
Right angle | measures exactly 90 degrees |
Straight angle | measures exactly 180 degrees (a straight line) |
Reflex angle | measures more than 180 degrees |
Intersecting | two (2) lines or segments that touch or cross each other |
Perpendicular | two(2) lines or segments that intersect at right angles |
Parallel | two (2) lines or segments that are the same distance apart at every point and will NEVER intersect |
Vertex | a corner of an angle or polygon (plural: vertices) |
Radius | the distance from the center of a circle to its surface |
Diameter | the distance of a line passing through the center of a circle to its surface (twice the radius) |
Perimeter | the length of the border (outside) of a 2-D shape |