Fill in the Blanks Section 1.1 and 1.2 VocabularyOnline version Fill in the blank using vocab. by Mrs. DeCarlo 1 line Collinear point segments Opposite point line coordinate endpoint plane initial ray Coplanar segment rays congruent 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 .