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Definition
| An angle with a degree measure less than 90. |
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Definition
| An obtuse angle is one that is greater than 90 degree's, but less than 180 degree's. |
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Definition
| An angle with a degree measure of 90. |
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Definition
| An angle with a degree measure of 180. |
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Definition
| either of two angles that added together produce an angle of 90°. |
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Definition
| either of two angles that added together produce an angle of 180°. |
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Definition
| Angles are congruent if they have the same angle measure in degrees. |
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Definition
| having the same measure of segments |
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Definition
| the point on a segment exactly halfway between the endpoints of the segment. |
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Definition
| A segment, line, or plane that intersects a segment at its midpoint. |
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Definition
| A ray that divides an angle into two congruent angles. |
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Definition
| Lines that form right angles. |
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| Reflexive Property of congruence |
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Definition
| A quantity is congruent (equal) to itself. |
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| Symmetric Property of Congruence |
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Definition
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| Transitive Property of Congruence |
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Definition
| If a = b and b = c, then a = c. |
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Term
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Definition
| The substitution property of equality states that for any real numbers a and b if a = b then a can be substituted for b. |
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Term
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Definition
| A line contains at least two points. |
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Term
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Definition
| A plane contains at least three noncollinear points. |
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Term
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Definition
| If two points lie in a plane, then the line joining them lies in that plane. |
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Term
| Intersection Lines Postulate |
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Definition
| If two lines intersect, then they intersect in exactly one point. |
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Term
| Intersecting Planes Postulate |
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Definition
| If two planes intersect, then their intersection is a line. |
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Term
| Segment Addition Postulate |
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Definition
| states that if B is between A and C, then AB + BC = AC. |
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Term
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Definition
| Angle Addition Postulate states that if a point S lies in the interior of ∠PQR, then ∠PQS + ∠SQR = ∠PQR. |
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Term
| Right Angle Pair Postulate |
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Definition
| All right angles are congruent. |
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Term
| straight Angle Pair Postulate |
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Definition
| All straight angles are congruent. |
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Term
| Theorem: All right angles are congruent |
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Definition
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Term
| Theorem: Vertical angles are congruent |
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Definition
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Term
| Supplementary angle theorem |
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Definition
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| Complementary angle theorem |
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Definition
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Definition
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Term
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Definition
| If a = b and c ≠ 0 then a/c = b/c. |
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Definition
| If a = b then a + c = b + c. |
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Term
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Definition
| If a = b then a – c = b– c. |
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