Problem #PRU-5016

Problems Geometry Euclidean geometry

Problem

  • We call two figures congruent if their corresponding sides and angles are equal. Let ABD an ABD be two right-angled triangles with right angle D. Then if AD=AD and AB=AB then the triangles ABD and ABD are congruent.

  • It follows from the previous statement that if two lines AB and CD are parallel than angles BCD and CBA are equal.