yes or no
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yes
That they are congruent.
vertical angles Congruent
the shape? no, not always. but they are always at least similar figures. but the angles alone are always congruent
Oh, dude, proving vertical angles are congruent? That's like proving water is wet. Helena just needs to show that those angles are opposite each other when two lines intersect. It's like saying, "Hey, these angles are equal because they're like mirror images of each other." Easy peasy lemon squeezy.