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Circumference

Distance around circle

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Diameter

A chord that passes through the center of the circle

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Radius

Segment that has one endpoint at the center and the other point on the circle

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Circle

The set of all points in a plane that are the same distance apart

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Alternate interior angles

Non-adjecent interior angles that lie on the same side of the transversal

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Corresponding angles

lie on the same side of the transversal and are in corresponding positions

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Plane

flat surface with no thickness that contains many lines and extends without end in the direction of all its lines

ABCD

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Point

location in space with no size

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Line

series of points that extends in opposite directions with no end

<-> <->

AB BA

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Line segment

Part of a line with 2 endpoints

___ ___

PQ QP

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Ray

Part of a line that has exactly one endpoint

<->

CR

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Parallel

Two lines that lie in the same plane and dont intersect

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Skew

Lines that are in the same plane and dont intersect and aren't parallel

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Acute

less than 90º angle

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Obtuse

Greater than 90º and less than 180º

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Straight angle

equal to 180º

straight line

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Adjacent

Share and vertex and a side but no common points

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Vertical

formed by two intersecting lines and are opposite

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Congruent

Angles that have the same measure

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Supplementary

sum of two angles is 180º

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Complementary

sum of two angles is 90º

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Transversal

Lines that intersect two other lines in different points

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Corresponding

Lie on the same side of the transversal and corresponding

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Polygon

closed plane figure with at least three sides that only meet at their endpoint

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Triangle

three sided polygon

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Acute triangle

3 acute angles

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Right triangle

1 right angle

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Obtuse triangle

1 obtuse angle

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Equilateral

3 congruent sides

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Isosceles triangle

2 congruent sides

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Scalene triangle

no congruent sides

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Trapezoid

At least one pair of parallel sides

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Paralellogram

both pairs of opposite sides are parallel

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Rhombus

four congruent sides

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Rectangle

four 90º angles

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square

four 90º angles and four congruent sides

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Regular polygon

all sides and angles congruent

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Chord

segment whose endpoints are in a circle

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formula for circumference

c=πd

c=πr2

c=circumference

d=diameter

2=2x

π=pi

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Central angle

angle whose vertex is the center of a circle

360º in a circle

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Perpendicular lines

lines, segments, or rays that intersect to form right angles

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segment bisector

lines, segments, or rays that divides a segment into two congruent segments

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perpendicular bisector

lines, segments, or rays that is perpendicular to the segment in bisects

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Angle bisector

ray that divides an angle into two congruent angles

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