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30 Cards in this Set
- Front
- Back
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Acute Angle
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An angle with measure greater than 0 degrees and less than 90 degrees.
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Right Angle
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An angle that measures exactly 90 degrees.
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Obtuse Angle
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An angle with measure greater than 90 degrees and less than 180 degrees.
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Vertical Angles
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The opposite angles where two lines meet.
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Acute Triangle
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A triangle in which all three angles measures are less than 90 degree.
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Right Triangle
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A triangle in which one angle is exactly 90 degrees.
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Obtuse Triangle
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A triangle with one angle greater than 90 degrees.
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Scalene Triangle
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A triangle with no equal sides.
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Isosceles Triangle
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A triangle with two or more sides of equal length.
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Equilateral Triangle
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A triangle with all equal side lenghts.
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Angle
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The measure between two line segments or rays.
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Triangle
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A polygon with three sides.
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Quadrilateral
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A polygon with four sides.
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Polygon
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A two-dimensional closed figure made up of of straight line segments.
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Trapezoid
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A quadrilateral with one pair of parallel sides.
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Parallelogram
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A quadrilateral with two pair of parallel sides.
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Rectangle
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A quadrilateral with four right angles.
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Rhombus
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A quadrilateral with all four sides having equal length.
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Square
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A quadrilateral with all four sides having equal length and four right angles.
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Regular Polygon
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A polygon in which all sides are equal length and all angles are also equal measure.
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Pentagon
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A polygon with five sides.
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Hexagon
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A polygon with six sides.
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Octagon
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A polygon with eight sides.
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Vertex
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The point where two sides of a polygon meet.
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Diagonal
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A line segment that connects a vertex of a polygon to another vertex of that same polygon. A diagonal cannot be an original side of the polygon.
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Circle
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A set of points at a fixed distance (radius) from a point (center).
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Parallel lines
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Two lines on a two-dimensional plane that will never cross eachother no matter how far they are extended.
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Perpendicular lines
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Two lines which make a right angle when they meet.
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Line Segment
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The part of a line between two points.
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Ray
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The part of the line that starts at a point and extends forever in one direction.
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