Complete the sentence with the phrase that makes the proof statement true. segment pr is perpendicular to segment qs. angle qrp is a right angle a. by the definition of perpendicular. b. because angle q is congruent to angle s. c. by the reflexive property of equality. d. because pqr is an isosceles triangle.

In the following diagram it is given that dec, ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2