OG详解-OG6 数学2 Q2

Choice A is correct. It’s given that angle 1 and angle 2 are vertical angles, and the measure of angle 1 is 72°. Vertical angles have equal measures. Therefore, the measure of angle 2 is 72°.
Choice B is incorrect. This is the measure of an angle that is supplementary, not congruent, to angle 1. Choice C is incorrect. This is the sum of the measures of angle 1 and angle 2. Choice D is incorrect and may result from conceptual or calculation errors.