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9.1-9.5 Definitions
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40
Mathematics
Undergraduate 3
10/03/2013

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Term
Point
Definition
"That which has no part"
Term
Line
Definition
"Length but no breadth"
Term
Plane
Definition
"Length and breadth only"
Term
Ray
Definition
A half line with its endpoint included
Term
Line Segment
Definition
A piece of a line joining two points and including the points
Term
Parallel Lines
Definition
Lines that lie on the same plane and have no points in common
Term
Intersecting Lines
Definition
Two different lines lying on the same plane are not parallel, then they have a single point in common
Term
Angle
Definition
Two rays having a common endpoint
Term
Initial Side
Definition
Defined as the ray where measurement of an angle starts
Term
Terminal Side
Definition
The ray where measurement of an angle stops
Term
Vertex
Definition
A corner or point where lines meet
Term
Acute Angle
Definition
An angle whose measure is between 0 degrees and 90 degrees
Term
Right Angle
Definition
Has a measure of 90 degrees
Term
Obtuse Angle
Definition
Has a measure between 90 degrees and 180 degrees
Term
Straight Angle
Definition
Has a measure of 180 degrees
Term
Complementary Angle
Definition
Sum of angle's measures is 90 degrees
Term
Supplementary Angle
Definition
Two angles having an angle sum of 180 degrees
Term
Perpendicular Angle
Definition
Two lines that intersect forming right angles
Term
Transversal
Definition
If we intersect a pair of parallel lines with a third line (transversal)
Term
Circle
Definition
The set of all points lying on a plane that are located at a fixed distance called the RADIUS
Term
Radius
Definition
The distance from the center to the edge of a circle
Term
Center
Definition
Center of a circle
Term
Diameter
Definition
A line segment passing through the center of a circle with both endpoints lying on the circle
Term
Circumference
Definition
The distance around the circle
Term
Central Angle
Definition
An angle that has its vertex at the center of a circle
Term
Closed Plane
Definition
If we can draw it without lifting the pen and if the starting and ending points are the same
Term
Simple Plane
Definition
If we can draw it without lifting the pen and in drawing it we never pass through the same point twice, with the possible exception of the starting and ending points
Term
Polygon
Definition
A simple, closed plane figure consisting only of line segments
Term
Edges
Definition
Line segments
Term
Vertex
Definition
Endpoint of an edge
Term
Regular Polygon
Definition
All of its edges are the same length and all of its angles have the same measure
Term
Convex Polygon
Definition
If for any two points X and Y inside the polygon, the entire segment XY also lies inside the polygon
Term
Similar Polygons
Definition
Their corresponding sides are proportional and their corresponding angles are equal
Term
Perimeter
Definition
Sum of the lengths of the sides of the polygon
Term
Area
Definition
Measure of the amount of surface that the polygon covers
Term
Volume
Definition
Gets measured using cubic units
Term
Meter
Definition
Length measurement is based on this, which is slightly more than a yard
Term
Liter
Definition
Volume is based on this, which is a little more than a quart
Term
Gram
Definition
The basic unit of weight in the metric system. About the weight of a large paper clip
Term
Kilogram
Definition
One thousand grams. This is about 2.2 pounds
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