1. Below is a two-column proof incorrectly proving that the three angles of ?PQR add up to 180: Which statement will accurately correct the two-column proof?(a) The measure of angle ZRY equals 180 by definition of a straight angle, (b) Angles QRY and PQR should be proven congruent before the construction of line ZY, (c) The three angles of ?PQR equal 180 according to the Transitive Property of Equality, (d)Line ZY should be drawn parallel to segment QR
   

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