Term
| An angle is a *right angle* if and only if... |
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Definition
| ...it has a measure of 90 degrees |
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Term
| Two lines are *perpendicular* if and only if... |
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Definition
| ... they intersect to form right angles |
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Term
| A ray *bisects* an angle if and only if... |
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Definition
| ...it divides the angle into two congruent angles |
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Term
| Two angles are *complementary* if and only if... |
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Definition
| ...their measures have a sum of 90 degrees |
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Term
| Two angles are *supplementary* if and only if... |
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Definition
| ...their measures have a sum of 180 degrees |
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Term
| A point is the *midpoint* of a segment if and only if... |
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Definition
| ...it divides the segment into two congruent segments |
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Term
| Two angles form a *linear pair* if and only if... |
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Definition
| ...they share a common vertex and a common side and the noncommon sides form a line (Ex: _/_ ) |
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Term
| Segment Addition Postulate: If R is between P and Q, then... |
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Definition
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Term
| Angle Addition Postulate: If S is in the interior of angle PQR, then... |
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Definition
| ...measure of angle PQS + measure of angle SQR = measure of angle PQR |
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Term
| Linear Pair Postulate: If two angles form a linear pair, then... |
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Definition
| ...they are supplementary |
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