David needs to find the area of a figure that can be separated into a square and a triangle. The base of the triangle is 8 cm, and its height is 12 cm. The length of the side of the square is equal to the base of the triangle. Which expression can David use to find the area of the figure? ​

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