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A plane

Flat surface extending forever in all directions

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A line

Straight path that extends forever in both directions

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Line segment

Straight path between two endpoints

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A angle

A figure formed by two rays that begin at the same point

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A point

Exact location in space

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Polygon

Closed figure formed by line segments joined only a their endpoints

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Parallel lines

Lines that do not cross

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Perpendicular lines

Lines that cross at 90 degree angle

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Hexagon

Polygon with six sides

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Octagon

Polygon with eight sides

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Decagon

Polygon with ten sides

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Right angle

Angle that is 90 degrees

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Regular polygon

All sides congruent and all angles congruent

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Diagonal

A line segment that joins two vertices of a polygon but it not a side

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Obtuse angle

Greater than 90 degrees and less than 180 degrees

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Acute angle

Angle less than 90 degrees

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Nonagon

Polygon with nine sides

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Heptagon

Polygon with seven sides

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Pentagon

Polygon with five sides

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Equilateral triangle

Three sides that have the same length

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Isosceles triangle

Two sides that have the same length

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Scalene triangle

No sides that have the same length

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Acute triangle

Less than 90 degrees

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Right triangle

90 degrees angle

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Obtuse triangle

Greater than 90 degrees

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Trapezoid

One pair of opposite sides parallel

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Parallelogram

Opposite sides parallel, opposite sides congruent

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Rhombus

Parallelogram, 4 congruent sides

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Rectangle

Parallelogram, 4 right angles

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Square

Parallelogram, 4 right angles, 4 congruent sides

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Transformation

The movement of a geometric figure

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Intersecting Lines

A straight path that has one end point and extends forever in the opposite direction

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Congruent figures

Figures that are the same size and same shape

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Similar figures

Figures that are the same shape and may or may not have the same size

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Line of symmetry

Place where a figure can be folded so that both halves are congruent

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Complementary angles

Angles that add up to 90

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Supplementary angles

Angles that add up to 180

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