Fill in the Blanks Section 1.1 and 1.2 VocabularyOnline version Fill in the blank using vocab. by Mrs. DeCarlo 1 point plane Collinear segments coordinate Opposite initial Coplanar endpoint point ray rays segment line congruent line The three undefined terms in Geometry are , , and . points are points that lie on the same line . points are points that lie on the same plane . A is a part of a line with two endpoints . A is a part of a line with one endpoint , called an , and extends in one direction . are two rays that have the same and extend in opposite directions . A is the real number that corresponds to a point on a line . Two segments with the same length are .