1. a location in space that has no size.
2.01 Geometry
Undefined terms:
_______:
Point
a location in space that has no size.
Line
a series of points that extend in two opposite directions without end.
Plane
a flat surface that extends in all directions without end.
Geometry
2.01 Geometry

2. Collinear points
______________:
a set of points that lie on the same straight line
Non-collinear points
__________________:
a set of three or more points that do not lie on the same straight line

3. Line segment
____________:
a set of points consisting of two endpoints on a line and all points between the endpoints A B AB

4. Congruent
__________:
two or more line segments or angles that have the same measure
Midpoint
________:
a point of a line segment that divides the segment into two congruent segments A M B

5. ________________:
Segment Bisector
any line or subset of a line that intersects the segment at its midpoint. M A B
Angle bisector
_____________:
a ray whose endpoint is the vertex of the angle and that divides the angle into two congruent angles. A E B C

6. Ray
____:
a part of a line that consists of a point on the line and all the points on one side of the endpoint. A B AB
Opposite rays
_____________:
two rays of the same line with a common endpoint and no other point in common

7. Angles
_____:
Acute
an angle whose degree measure is greater than 0 and less than 90.
Right
an angle whose degree measure is 90°.

8. Angles
______:
_______:
Obtuse
an angle whose degree measure is greater than 90 and less than 180
Straight
an angle that is the union of opposite rays and whose degree measure is 180°.

9. two angles whose sum measures 90 degrees
Pairs of angles
______________:
_____________:
Complementary
two angles whose sum measures 90 degrees A D B C
Supplementary
two angles whose sum measures 180 degrees D A B C

10. Pairs of angles ________: Adjacent
two angles in the same plane that have a common vertrex and a common side but do not have any interior points in common A D B C
Vertical
two angles in which the sides of one angle are opposite rays to the sides of the second angle A D E C B

11. two adjacent angles whose sum is a straight angle
Pairs of angles
_________:
Linear pair
two adjacent angles whose sum is a straight angle D A B C

12. ____________:
Parallel lines
are coplanar lines that have no points in common or have all points in common
Perpendicular lines
_________________:
two lines that intersect to form right angles
Skew lines
__________:
lines in space that are neither parallel nor intersecting.

13. _________:
Postulate
a statement whose truth is accepted without proof
Theorem
________:
a statement that is proved by deductive reasoning