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| If A=B and C=D, then A-C=B-D |
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| If A=B and C=D, then A+C=B+D |
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| If A=B, then either A or B may be substituted for the other in any equation |
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| If A=B and and B=C, then A-C |
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| If M is the midpoint of AB, then AM=1/2AB and MB=1/2AB |
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| Verticle angles are congruent |
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| If 2 lines are perpendicular, then they form congruent adjacent angles |
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| If 2 lines form congruent adjacent angles, then the lines are perpendicular |
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| If the exterior sides of 2 adjacent acute angles are perpendicular, then the angles are complementary |
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