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Definition
| two angles that have a sum of 90 |
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Definition
| two angles whose measures have sum 180 |
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Definition
| two sides of one angle are opposite rays to the sides of the other angle |
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Term
| angles addition postulate |
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Definition
| (only adds 2 angle measures)
m<1 + m<2=m |
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Term
| A line contains two points |
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Definition
| a plane contains at least three points not all in one line; space contains at least four points not all in one plane |
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Definition
| there is exactly one line |
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Definition
| there is at least one plane, and through any three noncollinear points there is exactly 1 plane |
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Definition
| then their intersection is a line |
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Term
| If two lines intersect, then they |
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Definition
| intersect in exactly one point |
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Term
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Definition
| and a point not in the line there is exactly one plane |
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Term
| If two lines intersect, then exactly |
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Definition
| one plane contains the lines |
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Definition
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Definition
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Definition
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Definition
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Term
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Definition
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Term
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Definition
| If DE≡FG and FG≡JK then DE≡JK |
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Term
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Definition
| If B is between A and C, then AB+BC=AC |
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Term
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Definition
| If point B lies in the interior of <AOC then m<AOB +m<BOC=m<AOC. If <AOC is a strait angle and B is any point not on AC then m<AOB+m<BOC=180 |
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Term
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Definition
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Term
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Definition
| If M is the midpoint of AB then AM = 1/2 AB adn MB=1/2 AB |
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Term
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Definition
| If BX is the bisector of <ABC, then m<ABX and m<XBC = 1/2 <ABC |
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Term
| If two lines are perpendicular |
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Definition
| then they form congruent adjacent angles |
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Term
| If two lines form congruent adjacent angles |
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Definition
| then the lines are perpendicular |
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