| Vertical Angles |
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Vertical Angles are congruent. |
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Figure 1. |
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When two lines intersect, the vertical angles are congruent. In this case, angles 1 / 4 and angles 2 / 3 are congruent.
| Adjacent Angles |
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Angles that share the same vertex and a common side are called Adjacent Angles. |
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Figure 2. |
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Above we have an example of two adjacent angles.
| Complementary Angles |
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Two angles are Complementary Angles if they sum to 90 degrees. |
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Figure 3. |
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Above we have an example of two complementary angles.
| Supplementary Angles |
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Two angles are Supplementary Angles if they sum to 180 degrees. |
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Figure 4. |
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Above we have an example of two supplementary angles.
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