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Unit 4

Ray A part of a line that has one endpoint and extends without end in one direction.
Angle A figure formed by two rays or line segments with a common endpoint.
Line A straight path that goes on forever in opposite directions.
Perpendicular Lines,line segments,or rays are perpendicular if they form right angles.
Parallel The same distance apart at every point.
Oblique Lines that are not parallel or perpendicular
Intersect To cut or divide by passing through or across
Protractor a tool used to measure angles
Degree A unit for measuring angles.
Right angle An angle that measures 90 degrees
Straight angle An angle of 180 degrees
Supplementary angles Angles having a sum of 180 degrees
Complementary angles Angles having a sum of 90 degrees
Opposite angle When two lines intersect
vertical angles pairs of opposite angles formed by intersecting lines
circle a plane figure that forms a closed path so that all the points on the path are the same distance from a point called the center
straight angle an angle of 180
reflex angle an angle that is greater than 180 degrees
Created by: 10031884