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64 Cards in this Set

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