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64 Cards in this Set
- Front
- Back
Plane Figure
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Another name for 2-dimensional figure.
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Polygon
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A closed 2-dimensional figure with sides that are line segments. The sides do not cross each other.
Example: Triangle and Pentagon |
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Open Figure
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A 2-dimensional figure that does not start and end at the same point.
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Closed Figure
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A 2-dimensional figure that starts and ends at the same point.
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Irregular Polygon
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A polygon whose sides and angles are not all of the same lengths and measures.
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Regular Polygon
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A polygon with congruent sides and congruent angles.
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Triangle
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A three-sided polygon.
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Quadrilateral
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A 4-sided polygon.
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Pentagon
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A 5-sided poygon.
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Hexagon
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A 6-sided poygon.
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Octagon
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A 8-sided poylgon.
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Decagon
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A 10-sided polygon.
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Point
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The exact location in space.
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Plane
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A flat surface that is endless in all directions.
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Line
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A series of points in a straight path that is endless in both directions.
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Line Segment
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Part of a line between two endpoints.
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Endpoints
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A point at the end of a ray or a line segment.
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Ray
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Part of a line that has one endpoint.
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Angle
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Formed by two rays with a commom endpoint.
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Vertex
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The endpoint of an angle.
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Interior
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All the points between the rays of an angle.
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Exterior
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All points that are not on the ray or in the interior of an angle.
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Protractor
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An instrument used to draw or measure angles.
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Degrees
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A unit used jto measure angles.
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Right Angle
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Exactly 90 degrees.
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Acute Angle
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Less than 90 degrees.
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Obtuse Angle
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Greater than 90 degrees but less than 180 degrees.
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Straight Angle
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Exactly 180 degrees.
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Intersecting Lines
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Lines that cross each other.
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Perpendicular Lines
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Lines that intersect each other at right angles.
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Parallel Lines
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Lines that are in the same plane and never intersect.
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Equilateral Triangle
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All three sides of the triangle are the same length.
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Isosceles Triangle
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Two of the three sides of the triangle are the same length.
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Scalene Triangle
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None of the side of a triangle are the same length.
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Right Triangle
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Has one right angle.
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Acute Triangle
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Has 3 acute angles.
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Obtuse Triangle
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Has 1 obtuse angle.
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Quadrilateral
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A 4-sided polygon.
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Square
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Has four sides that are all equal in length.
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Rectangle
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Has four right angles but the opposite sides are not equal in length.
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Parallelogram
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The opposite sides are equal in length and the opposite sides are parallel.
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Rhombus
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All the sides are equal in length and the opposite sides are parallel.
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Trapezoid
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It only has one pair of opposite sides.
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Kite
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It has two pairs of equal adjacent sides.
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Diagonal
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Connects two nonadjacent vertices of a polgon. Also used to find the sum of angles measured.
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Inital Ray
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Of two rays that form an angle, the one that stays fixed in place while the terminal ray swings out from it.
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Terminal Ray
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Of two rays that form an angle, the one that opens out from the initial ray.
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Center
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All Points on a circle that are the same distance from the center.
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Chord
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Line segment with endpoints on the circle.
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Diameter
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Chord tht passes through the center.
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Radius
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It is a line segment that extends from the center of the circle to a point on the circle.
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Central Angle
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Is an angle formed between 2 radi. The opposite central angles have the same measures.
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Slide
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It moves a figure horizontally, vertically, or diagonally.
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Flip
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It moves a figure to its reverse side over a real or imaginary line.
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Turn
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It moves a figure by rotating it around a point.
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Congruent Figures
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Figures that have the same shape and size.
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Corresponding Parts
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Matching parts of congruent figures.
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Similar Figures
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Has the same shape.
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Symmetric
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A figure is symmetric if it can be foled along a line so that the resulting halves match exactly, or are congruent.
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Line of Symmetry
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A line that divides a figure into two parts that match, or are congruent.
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Rotational Symmetry
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When a figure can be turned less than a complete turn around a center point and match the original.
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Ordered Pair
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A pair of numbers that gives the location of a point on a graph, map, or grid.
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Coordinates
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One of the numbers in an ordered pair.
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Plot
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To locate points on a coordinate grid.
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