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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

skew lines

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

angle

two rays that share a common end point

degree

1/360 of a complete rotation

perpendicular

two lines that intersect at a right angle

vertical angles

two non adjacent angles formed by two intersecting lines

transversal

a line which intersects two given lines in a plane

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

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

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

acute triangle

a triangle with all sides acute

parallelogram

a quadrelateral with both pairs of oppisite sides parallel

rectangle

a parallelogram with 4 congruent angles

trapizoid

a quadrelateral with exactly 1 pair of parallel sides

circle

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

radius

a segment joining the center to any point on the circle

chord

a segment with endpoints on the circle

arc

part of the circle

diameter

chord that passes through the center of the circle

circumference

the distance around the circle

central angle

vertex is center, sides are radii