SQRT is a parallelogram. If m∠QST = 72°, which of the following statements is true? quadrilateral SQRT has diagonals QT and SR that intersect at point U m∠SQR = 72° m∠QRT = 72° m∠QSR = 36° m∠TRQ = 108°

What is the next step in the given proof? choose the most logical approach. a. statement: m 1 + m 2 + 2(m 3) = 180° reason: angle addition b. statement: m 1 + m 3 = m 2 + m 3 reason: transitive property of equality c. statement: m 1 = m 2 reason: subtraction property of equality d. statement: m 1 + m 2 = m 2 + m 3 reason: substitution property of equality e. statement: 2(m 1) = m 2 + m 3 reason: substitution property of equality