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20 Cards in this Set
- Front
- Back
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Acute angle
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An angle whose measure is between 0 degrees and 90 degrees.
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Angle
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The opening that is formed when two lines, rays, or segments intersect.
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Geometry
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A major branch of mathematics that deals with shapes, sizes, and other properties of figures.
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Intersect
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To share a common point or points.
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Line
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A straight collection of points extending in opposite directions without end.
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Oblique
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Lines in the same plane that are neither parallel nor perpendicular.
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Obtuse angle
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An angle whose measure is between 90 degrees and 180 degrees.
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Parallel
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Lines in the same plane that do not intersect.
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Perpendicular
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Two lines that intersect at right angles.
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Plane
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A flat surface that has no boundaries.
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Point
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An exact position on a line, on a plane, or in space.
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Ray
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A part of a line that begins at a point and continues without end in one direction.
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Right angle
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An angle that forms a square corner and measures 90 degrees. It is often marked with a small square.
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Segment
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A part of a line with two distinct endpoints.
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Straight angle
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An angle that measures 180 degrees and thus forms a straight line.
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Vertex
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A point of an angle, polygon, or polyhedron where two or more lines, rays, or segments meet.
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Horizontal
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Parallel to the horizon, straight across.
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Sides of an angle
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The two rays that form an angle.
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Space
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The three-dimensional world in which we live.
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Vertical
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Straight up and down.
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