Three students attempt to define what it means for AB and CD to be perpendicular Fo O B D Can you match the teacher s comments to the definitions Definition of perpendicular lines Daniela s definition AB is perpendicular to CD if the measure of LAOC equals the measure of ZAOD Ori s definition AB is perpendicular to CD if AB and CD intersect perfectly sideways Kaori s definition AB is perpendicular to CD if one line can be mapped to the other by a rotation about point O of 90 Teacher s comments 27 Well done I hadn t previously considered defining perpendicular lines in terms of a rigid transformation like rotation but by golly it works Please rework your definition to use more precise mathematical language Well done Because the measure of ZCOD is 180 by the definition of a straight angle the measures of angles LAOC and LAOD must both be 90