Big Ideas Geometry - Chapter 1

acute angle - An angle that has a measure greater than 0⁰ and less than 90⁰ adjacent angle - Two angles that share a common vertex and side, but have no common interior points angle - A set of points consisting of two different rays that have the same endpoint angle bisector - A ray that divides an angle into two angles that are congruent axiom - A rule that is accepted without proof between - When three points are collinear, one point is between the other two. collinear - points that lie on the same line complementary angles - Two angles whose measures have a sum of 90⁰ congruent angles - two angles that have the same measure congruent segments - line segments that have the same length construction - A geometric drawing that uses a limited set of tools, usually a compass and a straightedge coordinate - a real number that corresponds to a point on a line coplanar points - points that lie in the same plane