The reason for statement 3 based on the information given is A. Definition of supplementary angles.
It should be noted that supplementary angles are the angles that when they're added, the sum will be equal to 180°.
It should be noted that the supplementary angles can be illustrated based on the linear pair.
In this case, angle 1 and angle 2 were added together to get 180°.
Therefore, the reason for statement 3 based on the information given is the definition of supplementary angles.
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