Final answer:
The reason for statement 7 of the two-column proof is the angle addition postulate.
Step-by-step explanation:
The reason for statement 7 of the two-column proof can be determined by examining the options provided. In this case, the correct reason is the angle addition postulate. The angle addition postulate states that if two angles are adjacent, then the measure of the larger angle is equal to the sum of the measures of the two smaller angles.
Statement 7 likely involves the addition or combination of two angles, based on the options given. By applying the angle addition postulate, we can determine the reason for statement 7.
For example, if angle A and angle B are adjacent angles, we can say that angle C is the sum of angle A and angle B, or C = A + B. This is the angle addition postulate in action.