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# Geometry Vocab.

### Use to study geometry vocabulary.

TermDefinition
Point Names an exact location in space.
Line Continues without end in both directions.
Ray Part of a line that has an endpoint and goes on forever in the other direction .
Line Segment Has two endpoints.
Intersecting Lines Lines that intersect at exactly one point and form 4 angles.
Perpendicular Lines Lines that intersect to form 4 right angles.
Parallel Lines Lines that never intersect and are always the same distance apart.
Angle Two rays with same endpoint.
Vertex The endpoint where two rays meet for form an angle.
Right Angle An angle that measure exactly 90 degrees.
Obtuse Angle An angle that measures more than 90 degrees but less than 180 degrees.
Acute Angle An angle that measures less than 90 degrees but more than 0 degrees.
Straight Angle An angle that measures exactly 180 degrees.
Acute Triangle A triangle with three acute angles.
Right Triangle A triangle with exactly 1 right angle and 2 acute angles.
Obtuse Triangle A triangle with exactly 1 obtuse angle and 2 acute angles.
Triangle A closed figure with 3 sides and 3 angles.
Quadrilateral A closed figure with 4 sides and 4 angles.
Rectangle A four sided figure with 2 sets of parallel sides, opposite sides are equal, and 4 right angles.
Square A four sided figure with 2 sets of parallel sides, 4 equal sides, and 4 right angles.
Trapezoid A four sided figure with 1 set of parallel sides.
Rhombus A four sided figure with 2 sets of parallel sides and 4 equal sides.
Parallelogram A four sided figure with 2 sets of parallel sides and opposite sides are equal.
Symmetry When a figure is folded along a line so that the two parts match exactly.
Protractor A math instrument used to measure angles.
Polygon A closed figure with straight sides.
Regular Polygon a polygon with all sides equal in length and all angles equal in measure.
Created by: khafer
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