Download Vocabulary Chapter 1B

Geometry Vocabulary
Chapter 1B
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
Collinear points- points that lie on a line
Coplanar points- points that lie in the same plane
Noncoplanar points- points that do not lie in the same plane
Opposite rays-two rays that have a common endpoint and form a line
Postulate- statement that is accepted as true without proof
Coordinate- a number on a ruler that corresponds to a point
Distance (between points)- absolute value of the difference of the coordinates
Tick marks- marks used to show segments are congruent
Construction-making a fairly exact replica of a given figure using a compass and straight edge
Between (two points)- a point is between two points only if the point is on the same line as the
two points
Midpoint (of a segment)-point that divides the segment into two congruent segments
Bisect- divide into two congruent parts
Straight Angles- angle with measure 180°
Angle bisector- ray that divides an angle into two congruent angles
Adjacent angles- two angles in the same plane with a common vertex and a common side but
no common interior points
Linear pair (of angles)- a pair of adjacent angles whose noncommon sides are opposite rays.
Complementary angles- two angles whose measures have a sum of 90°
Supplementary angles- two angles whose measures have a sum of 180°
Vertical angles- two nonadjacent angles formed by interesting lines
Legs- sides of a right triangle that form the right angle
Hypotenuse-side of a right triangle opposite the right angle
Transformation- change in the position, size or shape of a figure
Preimage- original figure
Image- resulting figure
Reflection- transformation where the image “flips” across a line of reflection.
Rotation- transformation where the figure “turns” around a point called the center of rotation
Translation- transformation where the all points in the figure “slide” in the same direction