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Definition
| if two lines are perpendicular, then they intersect to form 4 right angles |
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| if an angle is a right angle, then its measure is 90 degrees |
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| if two angles are complementary, then the sum of their angle measure is 90 |
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| if two angles are supplementary, then the sum of their angle measures is 180 |
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| if a point is the midpoint of a segment, then it divides the segment into two equal parts. OR if B is the midpoint of AC, then 1)B is between A and C and 2)AB=BC |
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Definition
| if a ray bisects an angle, then the angle is divided into two equal parts |
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| if two angles are adjacent and their non-common sides are opposite rays then they form a linear pair |
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| if two sides of two angles form two pairs of opposite rays, then the angles are vertical angles |
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Term
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Definition
| if a=b, then each may replace the other |
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