Question | Answer |
acute angle | an angle smaller then 90 degrees |
congruent angles | equal in measure |
coplanar | points and lines in the same plane |
midpoint | a point that divides a segment into two congruent segments. it bisects a segemnt. |
perpendicular lines | intersect to form right angles |
ray | a part of a line that consists of a initial point and all points on the line that lie on one side of the initial point. |
space | is the boundless 3-dimensional set of all points |
angle | two rays connected at their end points |
congruent segments | two segments with the same length |
counterexample | a single counter is enough to disprove a conjecture |
obtuse angle | an angle larger then 90 degrees |
plane | is a flat surface that has no thickness. it extends without end in all directions. you need at least 3 noncollinear points to name a plane. |
right angle | an angle that measures exactly 90 degrees |
angle bisector | cuts an angle into two congruent angles |
conjecture | a conclusion reached through inductive reasoning |
inductive reasoning | based on observed patterns |
opposite rays | start at the same point and go in opposite directions |
point | has no length, width, or thickness, but has a position |
segment | a portion of a line between two points, called end points |
collinear points | points that lie on the same line |
coordinate | the distance and directions from the origin of a number line. |
line | has no length, no width, or thickness. it extends without end in two directions. |
parallel lines | coplanar lines that do not intersect |
postulate | a statement to be true without proof |
skew lines | noncoplanar lines that are not parallel and do not intersect |