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Mathematics 9 Online
OpenStudy (leahhhmorgannn):

Below is a two-column proof incorrectly proving that the three angles of ΔPQR sum to 180°: http://prntscr.com/96ke28 Which statement will accurately correct the two-column proof? The measure of angle ZRY equals 180° by definition of supplementary angles. Angles QRY and PQR should be proven congruent before the construction of line ZY. The three angles of ΔPQR equal 180° according to Substitution. Line ZY should be drawn parallel to segment QR.

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