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Vocab terms (Test on Friday)
54
Mathematics
11th Grade
10/13/2011

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Term
Undefined terms
Definition
Basic figures in geometry which cannot be defined by using other figures
Term
Point
Definition
Names a location and has no size. It is represented by a dot.
Term
Line
Definition
A straight path that has no thickness and extends forever
Term
Plane
Definition
A flat surface that has no thickness and extends forever.
Term
Collinear
Definition
Points that lie on the same line
Term
Coplanar
Definition
Points that lie in the same plane
Term
Segment
Definition
The part of a line consisting of two points and all points between them
Term
Endpoint
Definition
A point at one end of a segment or the starting point of a ray
Term
Ray
Definition
A part of a line that starts at an endpoint and extends forever in one direction
Term
Opposite rays
Definition
Two rays that have a common endpoint and form a line
Term
Postulate, axiom
Definition
A statement that is accepted as true without proof
Term
Coordinate
Definition
A point corresponds to one and only one number on the ruler
Term
Distance
Definition
The absolute value of difference of the coordinates
Term
Length
Definition
The distance between A and B
Term
Congruent segments
Definition
Segments that have the same length
Term
Construction
Definition
A way of creating a figure that is more precise
Term
Midpoint
Definition
The point that bisects or divides, the segment into two congruent segments.
Term
Bisects
Definition
Divides
Term
Segment bisector
Definition
Any ray, segment, or line that intersects a segment at its midpoint.
Term
Angle
Definition
A figure formed by two says, or sides
Term
Vertex
Definition
A common endpoint of an angle
Term
Interior of an angle
Definition
The set of all points between the sides of the angle
Term
Exterior of an angle
Definition
The set of all points outside the angle
Term
Measure of an angle
Definition
Given in degrees
Term
Degree
Definition
1/360 of a circle
Term
Acute angle
Definition
Measures greater than 0° and less than 90°
Term
Right angle
Definition
Measures 90°
Term
Obtuse angle
Definition
Measures greater than 90° and less than 180°
Term
Straight angle
Definition
Formed by two opposite rays and measures 180°
Term
Congruent angles
Definition
Angles that have the same measure
Term
Angle bisector
Definition
A ray that decides an angle into two congruent angles
Term
Adjacent angles
Definition
Two angles in the same plane with a common vertex and a common side, but no common interior points
Term
Linear pair
Definition
A pair of adjacent angles whose noncommon sides are opposite rays
Term
Complementary angles
Definition
Two angles whose measures have a sum of 90°
Term
Supplementary angles
Definition
Two angles whose measures have a sum of 180°
Term
Vertical angles
Definition
Two nonadjacent angles formed by two intersecting lines
Term
Perimeter
Definition
The sum of the side lengths of the figure
Term
Base
Definition
Any side of a triangle
Term
Height
Definition
A segment form a vertex that forms a right angle with a line containing the base
Term
Diameter
Definition
A segment that passes through the center of the circle and whose endpoints are on the circle
Term
Radius
Definition
A segment whose endpoints are the center of the circle and a point on the circle
Term
Circumference
Definition
The distance around the circle
Term
(Pi) π
Definition
The ratio of a circle's circumference to its diameter
Term
Coordinate plane
Definition
A plane that is dicided into four regions by a horizontal line (x-axis) and a vertical line (y-axis)
Term
Coordinate plane
Definition
A plane that is dicided into four regions by a horizontal line (x-axis) and a vertical line (y-axis)
Term
Legs
Definition
The two sides that form the right angle
Term
Hypotenuse
Definition
The side across from the right angle that stretches from one leg to the other
Term
Transformation
Definition
A change in the position, size, or shape of a figure
Term
Preimage
Definition
The original figure
Term
Image
Definition
The resulting figure
Term
Image
Definition
The resulting figure
Term
Reflection
Definition
A transformation across a line, called the line of reflection
Term
Rotation
Definition
A transformation about a point P, called the center of rotation. Each point and its image are the same distance from P.
Term
Translation
Definition
A transformation in which all the points of a figure move the same distance in the same direction
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