Lines and Angles

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Lines and Angles

• JoAnne Hodgsons
• Geometry Unit

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Ray
Ray--part of a line that has one endpoint and
goes on endlessly in the other direction.
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Congruent
Equal in size and shape.
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Degrees
70
The unit used to measure angles.
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Line Segment
A part of a line that has two endpoints.
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Line
A series of points that go endlessly in both
directions.
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Vertex
The point at which two rays join together to form
an angle.
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Obtuse Angle
An angle that measures more than 90 degrees.
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Acute Angle
An angle that measures less than 90 degrees.
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Right Angle
An angle that measures 90 degrees.
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Straight Angle
An angle that measures 180 degrees. (a.k.a.
straight line)
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Parallel Lines
Two lines that are equal distance apart and
will never intersect.
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Perpendicular Lines
Two lines that intersect to form two right angles.