ANSWER
If two angles are complementary to the same angle (or to two congruent angles), then the two angles are congruent.
< means "Angle".
Hypothesis:<1 and <2 are complementary.<2 and <3 are complementary.
Conclusion: <1 equal and congruent to <3.
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The Opposite Sides Parallel and Congruent Theorem states that if a quadrilateral has a pair of opposite sides that are parallel and congruent, then the quadrilateral is a parallelogram.
if two angles are supplements of congruent angles, then the two angles are congruent.
Pythagorean theorem
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hypotenuses