In triangle ABC, not drawn to scale, AB is 17cm, AC is 15cm. BC is x cm and angle BCA is 90°. The value of x is: (a) 7 (b) 8 (c) 9 (d) 12​

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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