###
point

an infinitely small exact location

###
3 undefined terms

point, line, plane

###
line

an infinitely long infinitely thin straight path

###
plane

an infinitely long infinitely wide fat surface

###
Axiom

a mathimatical statement which we except as true because no counter example exists

###
line segment

part of a line with two endpoints

###
ray

part of a line with one endpoint

###
collinear

a set of points that lie on a common line

###
any two points are collinear

axiom

###
intersection

two geometric figures points in common

###
parallel lines

two lines on a plane that will never intersect

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skew lines

two lines that will never intersect but are not on the same plane

###
angle

two rays that share a common end point

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degree

1/360 of a complete rotation

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perpendicular

two lines that intersect at a right angle

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vertical angles

two non adjacent angles formed by two intersecting lines

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transversal

a line which intersects two given lines in a plane

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pairs of corresponding angles

angles which: are on the same side of the transversal, one interior and one exterior, and non adjecent

###
alternate interior angles

both on interior, opposite sides of transversal, non adjacent

###
polygon

a closed figure made up of line segments with no interior reflex angles

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regular polygon

a polygon with all congruent sides and all congruent angles

###
steps to finding perimeter

formula, substitute, simplify

###
isosceles triangle

a triangle with at least two congruent sides

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scalene

all sides of the triangle are differnent

###
the sum of the measures of any triangles angles is 180

axiom

###
right triangle

a triangle with 1 right angle

###
obtuse triangle

a triangle with 1 obtuse angle

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acute triangle

a triangle with all sides acute

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parallelogram

a quadrelateral with both pairs of oppisite sides parallel

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rectangle

a parallelogram with 4 congruent angles

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trapizoid

a quadrelateral with exactly 1 pair of parallel sides

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circle

the set of all points equidistant form a given point on a plane

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radius

a segment joining the center to any point on the circle

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chord

a segment with endpoints on the circle

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diameter

chord that passes through the center of the circle

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circumference

the distance around the circle

###
central angle

vertex is center, sides are radii

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