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geometry val
chapter 1 leson 1.1, 1.2,1.3
Question | Answer |
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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 |