Point
A location with no dimenstion
Line
a series of points extending in two directions forever
Ray
A part of a line that starts at a point and extends in one direction forever
Line Segment
A part of a line between two end points and all points in between
Intersecting Lines
Two lines that have exactly one point in common
Perpendicular Lines
Two lines that intersect at a right angel, 90
Plane
A flat surface that extends forever
Parallel Lines
two lines in the same plane that do not intersect
Skew lines
two lines that do not intersect and are not parallel; they are not in the same plane
Angle
a figure formed by two rays with a common endpoint
certex
a point of intersection of two sides of an angle or figure
acute angle
an angle smaller than 90
Right Angle
a 90 angle
obtuse angle
an angle larger than 90 but smaller than 180
straight angle
a 180 angle
reflex angel
and angle larger than 180
complementary
Two angles whose measures add up to 90
Supplementary Angels
Two angles whose measures add up to 180
Adjacent Angles
two angles that share one side
linear pair
supplementary angels that are adjacet
congruent
figures with the same exact size and shape
Vertical Angles
angles formed by two intersecting line that are opposite each other
transversal
a line that intersects two or more other lines
triangle
a plygon with three congruent sides
equilateral triange
a triangle with three congruent sides
isosceles triangle
a triangle with two congruent sides
scalene triangle
A triangle with no congruent sides
acute triangle
a triangle with three angles less than 90
right triangle
a triangle with a 90 angle
obtuse triangle
a triangle with one angle greater than 90
polygon
a closed figure whose sides are formed by line segments that only meet at their end points
quadrilateral
a polygon with 4 sides
pentagon
a polygon with 5 sides
hexagon
a polygon with 6 sides
heptogon
a polygon with 7 sides
octagon
a polygon with 8 sides
nonagon
a polygon with 9 sides
decagon
a polygon with 10 sides
n-gon
a polygon with n sides
regular polygon
a polygon with all congruent sides and congruent angles
irregular polygon
an polygon with sides and or angles that are not all congruent
interior angle
an angle within a polygon
exterior angle
the angle formed outside a polygon when one side is extended
trapezoid
a quadrilateral with exactly one pair of parallel sides
parallelogram
a quadrilateral with both pairs of opposite sides parellel
rectangle
a parallelogram wit hfour fight angles
rhombus
a parallelogram with four right congruent sides
aquare
a rhombus with four right angles
circle
the set of ppooints in a plane that are all the same distance from a given point called the center
radius
a segment that connects the center of a circle to the circle
diameter
a segment that passes through the center of a circle and has its endpoints on the circle
central angle
an angle with its vertex at the center of a circle
chord
a segment that has both endpoints on the circle
arc
part of a circle
semicircle
a closed figure that consists of half a circle and its diameter