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# geometry val

### chapter 1 leson 1.1, 1.2,1.3

conjecture an unproven statement that is based on observation
point a point has no dimension. it is usually represented by a small dot
line is defined by 2 points; a line extends in one dimension; usually represented by a straight line with two arrow heads to indicate that the line extends without end in two directions
plane is defined by 3 points; a plane extends in two dimensions; is usually represented by a shape that looks like a tabletop or a wall
line segment part of a line that consists of two ponts called endpoints and all point on the line that are in between the endpoints; segment
ray part of a line that consists of a point, called an initial point, and all points on the line that extend in one direction
postulate rules that are accepted without proof; also called axioms
length of a segment the distance between the end points of a segment
congruent segments segments that have the same length
measure of an angle consider a point A on one side of line OB. The rays of the from O,A can be matched one to one with the real numbers from 0 to 180. The measure of the angle AOB is equal to the absolute value of the difference between the real numbers for ray OA and ray OB
acute angle an angle with measure between 0 and 90 degrees
right angle angle with measure equal to 90 degrees
obtuse angle an angle with measure between 90 and 180 degrees
straight angle an angle wih measure equal to 180 degrees
segment bisector a segment,ray line, or plane that intersects a segment at its midpoint
angle bisector a ray that divides an angle in two adjacent angles that are congruent
vertical angles two angles whose sides form two pairs of opposite ray
complementary angles two angles whose measures have the sum 90 degrees
supplementary angles two angles whose measures have the sum 180 degrees
congruent angles angles that have the same measurement
Created by: softball1