PQCD - What does PQCD stand for? The Free Dictionary
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Since m[angle]DPQ = m[angle]PQR, (because trapezium PQC'D' is a reflection of trapezium PQCD
along the line segment PQ) and m[angle]DPQ = m[angle]RPQ (because alternate interior angles are congruent when a transversals intersects two parallel lines), APQR is an isosceles triangle with m[angle]PQR = m[angle]RPQ.