Fill in the Blanks Unit 1 VocabularyOnline version point line plane vocab by Mrs. DeCarlo 1 complementary angle collinear line bisector congruent ray adjacent supplementary segment midpoint coplanar points on the same plane - a part of a line with one endpoint - two angles with a common endpoint and a common side - points on the same line - Two planes intersect in a . Two angle with the same measure are called angles . two angles with a sum of 90 - angles a point that divides a segment into two congruent segments - a part of a line with two endpoints - a ray that divides an angle into two congruent angles - two angles with a sum of 180 - angle s