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Geometry vocabulary

Lines, rays, points

Acute Angle An angle that measures less than 90 degrees.
Obtuse Angle An angle that measures more than 90 degrees but less than 180 degrees.
Right Angle An angle that measures exactly 90 degrees.
Straight Angle An angle that measures exactly 180 degrees. A straight line.
Complementary angles Two angles that together equal 90 degrees (right angle). They also share a vertez and a ray.
Supplementary angles Two angles that share a vertex and a ray; together they form a straight angle (180 degrees).
Point An exact location in space, usually represented by a dot.
Line A straight path in space, extending in both directions with no endpoint.
Ray A part of a line, it hegins at an endpoint and extends forever in one direction.
Intersecting lines Lines that cross each other at exactly one point.
Parallel lines Lines in a plane that will never intersect.
Perpendicular lines Two lines that intersect to form right angles.
Vertex The point where two rays join to form an angle.
Created by: trockwell