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.
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Once you prove that a diagram is congruent then you can say that all the parts are congruent.
A+
false I think
diagram of cuboid
Certain kinds of trapezoids only have one pair of equal angles. Like so... ________ |...............\ |................\ |.................\ |..................\ ---------------- See? The only congruent angles are the two right angles on the left side. (Ignore the dots, it was the only way I could get my diagram to format properly)