How do you prove each of the following theorems using either a two-column, paragraph, or flow chart proof?

• Triangle Sum Theorem
• Triangle Inequality Theorem
• Isosceles Triangle Theorem
• Converse of the Isosceles Triangle Theorem
• Midsegment of a Triangle Theorem
• Concurrency of Medians Theorem

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