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Cards In This Set
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Point
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An exact location in space.
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Line
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An endless straight path with no endpoints. It is named by two points placed on it.
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Ray
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A part of a line that has one endpoint and continues without end in one direction. It is named by placing two points on it.
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Line segment
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A part of a line that includes two endpoints and all of the points between them. It is named by its two endpoints.
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Plane
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An endless flat surface. It is named by using three points that are not on a line.
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Angle
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This is formed by two rays that share the same endpoint. It is named by using a point on each side and its vertex as the middle letter. It can also be named by using only its vertex.
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Degree
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The unit of measure for an angle.
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Parallel lines
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Lines in a plane that never intersect and are the same distance apart at every point.
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Intersecting lines
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Lines that cross at one point.
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Right angle
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An angle that measures 90 degrees.
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Perpendicular lines
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Lines that intersect to form four right angles.
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Acute angle
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An angle that measures greater than 0 degrees and less than 90 degrees.
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Obtuse angle
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An angle that measures greater than 90 degrees and is less than 180 degrees.
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Straight angle
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An angle that measures 180 degrees.
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Protractor
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An instrument used for measuring or drawing angles.
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