(01.07 MC) Line ED is parallel to FB. Transversal GH crosses line ED at C and crosses line FB at A. The measure of angle ECG is 121 degrees. Greg is constructing a fence that consists of parallel sides line ED and line FB. Complete the proof to explain how he can show that m∠FAC = 121° by finding the missing justifications. Statement Justification line ED ∥ line FB m∠ECG = 121° Given m∠ECG + m∠ECA = 180° Linear Pair Postulate m∠FAC + m∠ECA = 180° 1. m∠ECG + m∠ECA = m∠FAC + m∠ECA Transitive Property m∠ECG = m∠FAC Subtraction Property m∠FAC = m∠ECG Symmetric Property m∠FAC = 121° 2. 1. Corresponding Angles Theorem; 2. Definition of Supplementary Angles 1. Definition of Supplementary Angles; 2. Corresponding Angles Theorem 1. Same-Side Interior Angles Theorem; 2. Substitution Property 1. Substitution Property; 2. Same-Side Interior Angles Theorem