I'll name !   attention geometry in the figure below, segment ac is congruent to segment ab: triangle abc with a segment joining vertex a to point d on side bc. side ab is congruent to side ac which statement is used to prove that angle abd is congruent to angle acd? triangle acd is similar to triangle abd. triangle acd is congruent to triangle abd. segment ad is congruent to segment ac. segment ad is congruent to segment dc.