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# Geometry Chapter 1 K

### Vocabulary

TermDefinition
undefined term a basic figure not defined in terms of other figures
point an undefined term in Geometry that has no size
line a set of points extending infinitely in two directions
plane a flat surface with no thickness that extends forever
collinear points on the same line
coplanar points on the same plane
segment part of a line with 2 endpoints
endpoint one end of a segment or the starting place for a ray
ray a set of points extending infinitely in 1 direction
opposite rays 2 rays with a common endpoint that form a line
postulate a statement accepted as true without proof
coordinate a point that corresponds to a number
distance the absolute value of the difference in the coordinates
length the distance between 2 points
congruent segments 2 segments with the same length
construction a way to creating a more precise figure, in Geometry we use a compass and straightedge
between B is between A and C if and only if they points are collinear and AB + BC = AC.
midpoint a point that divides a segment into 2 congruent parts
bisect to cut into 2 congruent parts
segment bisector any ray, segment, or line that intersects a segment at its midpoint
angle 2 rays that have a common endpoint
vertex the common endpoint shared by the 2 rays of an angle
interior of an angle the set of all points between the sides of an angle
exterior of an angle the set of all points outside an angle
measure the size of an angle, in degrees
degree 1/360 of a circle
acute angle an angle less than 90 degrees
obtuse angle an angle greater than 90 degrees
right angle an angle that measures exactly 90 degrees
straight angle an angle that measure 180 degrees
congruent angles 2 angles with the same measure
angle bisector any line, segment, or ray that divides an angle into 2 congruent parts
adjacent angles 2 angles that share a common side and vertex
linear pair 2 adjacent angles that form a straight line
complementary angles a pair of angles that have a sum of 90 degrees
supplementary angles a pair of angles that have a sum of 180 degrees
vertical angles 2 angles whose sides form opposite rays
coordinate plane a plane that is divided into 4 regions by a horizontal and vertical axis
leg the sides of a right triangle that form the right angle
hypotenuse the side of a right triangle that is opposite the right angle
transformation the change in the position, size, or shape of a figure
preimage the original figure in a transformation
image the new figure in a transformation
reflection (a flip) a transformation across a line called the line of reflection
translation (a slide)a transformation in which all the points of a figure move the same direction in the same distance
rotation (a turn)a transformation about a point P called a center of rotation
Created by: stacykeener