Geometry chapter 1
pie
3.14
undefined term
A basic figure that is not defined in terms of other figures. The undefined terms in geometry are point, line, and plane.
segment
A part of a line that consists of two end points and all points between them.
ray
A part of a line that starts at an endpoint and extends forever in one direction.
endpoint
A point at an end of a segment or the starting point of a ray.
angle bisector
A ray that divides an angle into two congruent angles
coordinate plane
A two-dimensional region determined by a pair of axes and that uses numerical values to represent the location of an object.
line
An undefined term in geometry, a line is a straight path that has no thickness and extends forever.
plane
An undefined term in geometry, it is a flat surface that has no thickness and extends forever.
point
An undefined term in geometry, it names a location and has no size.
linear pair
Two adjacent angles whose noncommon sides are opposite rays
supplementary angles
Two angles whose sum is 180 degrees
angle
a biased way of looking at or presenting something
length
a section of something that is long and narrow
leg
a section or portion of a journey or course
segment bisector
a segment, ray, line, or plane that intersects a segment at its midpoint
rotation
a single complete turn (axial or orbital)
base
a support or foundation
image
a visual representation (of an object or scene or person or abstraction) produced on a surface
coordinate
acoordinates number used to identify the location of a point
congruent angles
angles that have the same measure
postulate
apostulates statement that is accepted as true without proof. aka axiom
adjacent angles
are a pair of angles with a common vertex and a common side, but no common interior points
construction
drawing a figure satisfying certain conditions as part of solving a problem or proving a theorem
straight angle
exactly 180 degrees
right angle
exactly 90 degrees
measure
how much there is of something that you can quantify
between
in between
acute angle
less than 90 degrees
height
natural height of a person or animal in an upright position
hypotenuse
the side of a right triangle opposite the right angle
circumference
the size of something as given by the distance around it
perimeter
the size of something as given by the distance around it
complementary angles
two angles whose sum is a right angle
Opposite rays
two rays that have a common endpoint and form a line
collinear
Points that lie on the same line.
interior of an angle
The set of all points between the sides of an angle.
exterior of an angle
The set of all points outside an angle.
Coplanar
Points that lie in the same plane.
vertical angles
TWO angles whose sides form two pairs of opposite rays
congruent segments
segments that have the same length
transformation
the act of changing in form or shape or appearance
translation
the act of uniform movement
degree
the highest power of a term or variable
reflection
the image of something as reflected by a mirror (or other reflective material)
radius
the length of a line segment between the center and circumference of a circle or sphere
diameter
the length of a straight line passing through the center of a circle and connecting two points on the circumference
preimage
the original figure
vertex
the point of intersection of lines or the point opposite the base of a figure
distance
the property created by the space between two objects or points
