## H Geometry Unit 1

##### Created by:

wadelavigne Plus on January 15, 2012

##### Description:

Vocabulary for unit 1

Pop out
No Messages

# H Geometry Unit 1

 geometrythe pure mathematics of points and lines and curves and surfaces
1/40
Preview our new flashcards mode!

Order by

#### Definitions

geometry the pure mathematics of points and lines and curves and surfaces
point a specific location in space with no size or shape
line an endless collection of points along a straight path
plane (mathematics) an unbounded two-dimensional shape
between When three points lie on a line, you can say that one of them is between the other two.
congruent Having the same size and shape
coordinate a number that identifies a position relative to an axis
number line a line for representing and graphing numbers. Each point on the line corresponds to a number.
angle two rays with a common endpoint
adjacent having a common boundary or edge
linear pair two adjacent angles whose noncommon sides are opposite rays
supplementary angles two angles whose measures have a sum of 180 degrees
complementary angles two angles whose measures have a sum of 90 degrees
right angle the 90 degree angle between two perpendicular lines
acute angle an angle less than 90 degrees but more than 0 degrees
obtuse angle An angle that measures more than 90 degrees but less than 180 degrees
straight angle an angle that measures 180 degrees
vertex of an angle The common endpoint of the rays of an angle
angle bisector a ray that divides an angle into two congruent angles
midpoint a point that divides a segment into two congruent segments
perpendicular bisector a segment, ray, line, or plane that is perpendicular to a segment at its midpoint
conjecture reasoning that involves the formation of conclusions from incomplete evidence
perpendicular lines Two lines that intersect to form right angles
centroid the point of concurrency of the medians of a triangle.
circumscribed circle A circle that goes around a triangle and passes through its vertices.
inscribed circle a circle inside the triangle that touches each side at one point
cirumcenter segments used: perpendicular
bisectors
notes: center of the circle containing the traingle's vertices
incenter Point of concurrency of the angle bisectors of a triangle
median segment from a vertex to the midpoint of the opposite side
dilation A transformation that changes the size of an object, but not the shape.
pre-image the original figure in a transformation
transformation a change in the size or position of a figure
image The new figure that is produced in a transformation
reflection a transformation of a figure that flips the figure across a line
isometry a transformation in which the preimage and image are congruent
rotation (mathematics) a transformation in which the coordinate axes are rotated by a fixed angle about the origin
coordinate plane A two-dimensional region determined by a pair of axes and that uses numerical values to represent the location of an object.
x-axis the horizontal line on a graph
y-axis the vertical line on a graph
ordered pair A pair of numbers, (x, y), that indicate the position of a point on a Cartesian plane.

### First Time Here?

Welcome to Quizlet, a fun, free place to study. Try these flashcards, find others to study, or make your own.