###
obtuse angle

An angle greater than 90 degrees

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line

A straight path of point that goes on and on in two directions

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angle

An angle is a figure formed by two rays that have the same point

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parallel lines

In a plane, lines that never intersect

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perpendicular lines

Two intersecting lines that form a right angle

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1 ray

A ray is part of a line that has one end point

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acute angle

An acute angle is smaller than a right angle

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point

A point is a an exact location in space

###
polygon

Closed place figure made up of line segments

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line segment

A part of a line with two end points

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acute triangle

An acute triangle has three acute angles

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equilateral triangle

triangle with three equal sides

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Isosceles triangle

triangle with two equal sides

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Intersecting lines

lines that cross at one point

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Quadrilateral

a four sided polygon

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octagon

an eight sided polygon

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hexagon

a six sided polygon

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side

each line segment is a side

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right angle

a right angle is a 90 degree angle

###
straight angle

an angle that is a straight line, 180 degrees

###
triangle

a three sided polygon

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vertex

where two sides meet

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plane

an endless flat surface

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