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# Geometry -1

### AP Geometry Chapter 1 Definitions

TermDefinition
Names a location and has no size. It is represented by a dot Point
A straight path that has no thickness and extends forever Line
A flat surface that has no thickness and extends forever Plane
Points that lie on the same line are Collinear
Points that lie on the same plane are Coplanar
The part of a line consisting of two points and all points between them. Segment
A point at one end of a segment or the starting point of a ray. Endpoint
A part of a line that starts at an endpoint and extends forever in one direction Ray
Two rays that have a common endpoint and form a line Opposite Rays
A statement that is accepted as true without proof Postulate
A point that corresponds to one and only one spot on a line Coordinate
The absolute value of the difference of the coordinates Distance
Another term for Distance Length
Segments that have the same length. Congruent Segments
A way to of creating a figure that is more precise Construction
The point that divides a segment into two congruent segments Midpoint
When given 3 points and all three points lie on the same line, one point can be said to be ___________ the other points. Between
To divide into congruent parts Bisect
A line, ray or segment that divides a segment into two congruent segments Segment Bisector
An angle that measures greater than 0° and less than 90° Acute Angle
A figure formed by 2 rays with a common endpoint Angle
A ray that divides an angle into two congruent angles Angle bisector
Angles that have the same measurement Congruent angles
A unit of angle measure and is 1/360 of a circle Degree
The set of all points outside an angle Exterior of an angle
The set of all points between the sides of an angle Interior of an angle
The difference of 360° and the measure of the associated minor arc Measure of a major arc
An angle that measures greater than 90° and less than 180° Obtuse angle
An angle that measures 90° Right angle
An angle formed by two opposite rays that measures 180° Straight angle
The common endpoint of the sides of the angle Vertex of an angle
Two angles in the same plane with a common vertex and a common side, but no common interior points Adjacent angles
Two angles whose measures have a sum of 90° Complementary angles
A pair of adjacent angles whose non common sides are opposite rays Linear pair
Two angles whose measures have a sum of 180° Supplementary Angles
The nonadjacent angles formed by two intersecting lines Vertical angles
The number of non-overlapping unit squares of a given size that will exactly cover the interior of a plane figures Area
Any side of a triangle Base
The distance around a circle Circumference
(The length of) A segment that passes through the center of a circle and whose endpoints are on the circle. Diameter
A segment from a vertex that forms a right angle with a line containing the base Height of a triangle
The sum of the side lengths of a closed plane figure Perimeter
The ratio of the circumference of a circle to it's diameter pi
a segment whose endpoints are the center of a circle and a point on the circle Radius
A plane that is divided into four regions by a horizontal line called the x-axis and a vertical line called the y-axis Coordinate plane
The side opposite the right angle in a right triangle Hypotenuse
One of the two sides of the right triangle that form the right angle Leg
A change in the position, shape or size of a figure. Transformation
a shape that RESULTS from a transformation of a figure known as a preimage Image
The original figure in a transformation Preimage
A transformation across a line, where each point and is image are the same distance for the line of reflection Reflection
A transformation about a point P where each point and it's image are the same distance from P Rotation
A transformation in which all the points of a figure move the same distance and same direction Translation
Created by: renardk

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