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rhombus

A parallelogram with all sides the same length

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rectangle

a parallelogram with four right angles

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isosceles triangle

a triangle with two equal sides

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parallelogram

A quadrilateral with two pairs of parallel sides

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trapezoid

a quadrilateral with exactly one pair of parallel sides

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square

A rectangle with all sides the same length.

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vertex

The common endpoint of an angle

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hexagon

a six-sided polygon

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obtuse triangle

a triangle with one obtuse angle

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right triangle

a triangle with one right angle

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scalene triangle

a triangle with no two sides of equal length

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equilateral triangle

a triangle with three equal sides

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octagon

a polygon with eight sides

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quadrilateral

A polygon with 4 sides

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triangle

a three-sided polygon

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pentagon

a polygon with 5 sides

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regular polygon

a polygon with all sides and all angles equal

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polygon

A closed plane figure made up of line segments

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degrees

a unit for measuring angles

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protractor

an instrument for drawing/measuring angles

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straight angle

an angle that measures 180 degrees

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obtuse angle

An angle more than 90 degrees

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right angle

an angle that measures 90 degrees

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angle

two rays with a common endpoint

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acute angle

An angle less than 90 degrees

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plane

An endless flat surface

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line segment

part of a line with two endpoints

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point

An exact location in space

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intersecting lines

lines that cross at one point

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ray

Part of a line that has one endpoint and extends forever in one direction.

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line

A straight path of points that goes on forever in two directions

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perpendicular lines

Two lines that intersect to form right angles

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parallel lines

Lines in the same plane that do not intersect

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acute triangle

a triangle with 3 acute angles

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