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| A ray has one endpoint and extends in one direction without ending. |
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| two rays with a common endpoint form an angle. |
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| the common endpoint where two rays meet is called a vertex. |
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| an acute angle has a measure of less than 90 degrees. |
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| a right angle measures exactly 90 degrees. |
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| has a measure of greater than 90 degrees and less than 180 degrees. |
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| has a measure of exactly 180 degrees. |
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| two angles that add up to 90 degrees. |
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| two angles that add up to 180 degrees. |
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| two angles that have the same measure are congruent. |
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| a ray that divides an angle into two congruent(same) angles bisects the angle. |
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| the name of the ray that divides an angle into 2 congruent angles. |
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| is an infinite flat surface. lines in a plane never meet. |
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| two lines that never meet are parallel. |
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| lines that intersect two or more parallel lines in this way are called transversals[image] |
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| alternate interior angles |
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| Numbers 3,5 and 4,6 are alternate interior angles. [image] |
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| 2,6 and 1,5 and 3,7 and 4,8 are corresponding angles. |
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| 1,3 and 2,4 and 6,8 and 5,7 are vertical angles. |
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| a point that divides a line segment in two equal length parts.[image] |
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| congruent segments have equal lengths. |
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| a line that pass through the midpoint of a line. If a line were to pass through the red dot it would be a segment bisector.[image] |
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| two lines that cross each other and create a 90 degree angle are perpendicular. |
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| line AB is perpendicular to line CD. Line AM is congruent(same length) with line BM.[image] |
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