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Polygon

a closed figure with 3 or more line segments

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quadrilateral

a polygon with four sides

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pentagon

a polygon with five sides

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angles

the figure formed by 2 rays with the same endpoint

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octagon

a polygon with eight sides

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decagon

a polygon with 10 sides

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scalene

a shape with no congruent sides

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isosceles

a shape with more than 1 congruent sides

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equilateral

a polygon with all sides congruent

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right

a shape or figure with a 90 degree angle

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parallelogram

a quadrilateral whose opposite sides are parallel

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rectangle

a parallelogram with four right angles

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trapezoid

a quadrilateral with one pair of parallel sides

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square

a rectangle which is equilateral

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degrees

the basic unit by which angles are measured

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vertex

the intersection of the two sides of an angle i

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points

a dot that represents a location in a plane or space

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line

a straight path of points that extend forever in opposite directions

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plane

a flat surface that extends forever in all different directions

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ray

part of a line that has 1 endpoint and extends forever in only 1 direction

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line segment

part of a line consisting of 2 endpoints and all the points between them

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congruent

shapes that are exactly the same

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intersection

the set of points that are common to 2 or more lines

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parallel

lines in the same place but do not intersect

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vertex

the point at the corner with an angle, plane angle, or solid figure

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measure

the measure of something (angle)

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protractor

to use and approximate the measure of an angle

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perpendicular

2 lines that meet at right angles

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complementary

2 angles that if the sum of their measure is 90 degrees

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supplementary

2 angles and if the sum of their measure is 180 degrees

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vertical angles

angles that are formed by intersecting lines (angles across from each other)

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corresponding angles

angles that are formed by intersecting lines (horizontal lines that form angles)

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skew lines

in 3-D world, lines don't cross but not parallel

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scalene triangle

all sides have different lengths

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isosceles triangle

at least 2 sides have to be the same

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equilateral triangle

all 3 sides have to be the same (60 degrees)

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acute triangle

if all 3 angles are acute

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obtuse triangle

if 1 of the angles are obtuse

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right triangle

if one of the angles is a right angles

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