not all congruent angles are vertical angles. Vertical angles must share a vertex.
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In a Linear Pair the 2 angles add up to 180 degrees while Vertical Angles are just 2 vertical angles that are congruent.
have the same vertex. be congruent.
yes or no
Vertical angles must be congruent so if they are complementary, they must be 45 degrees to be complementary.
Of course not. The right angles at the corners of my book are certainly not vertical with the right angles at the corners of your computer screen, but they're congruent. The "if" is true, but the "only if" is not. Verticality is sufficient but not necessary for congruence.