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First Semester Vocabulary Geom

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Across
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A segment that begins at a vertex of a triangle and forms a right angle with the opposite side
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Two lines that will never intersect
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Any four sided figure
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If two lines are perpendicular, they have opposite _________ slopes
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The union of two rays
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An angle that has a measure between 90˚ and 180˚
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One interior, one exterior, same side of transversal
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A reason used in a proof to say that something is congruent to itself
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A triangle that has two congruent sides
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A segment that begins at s vertex of a triangle and divides the opposite side into two congruent parts
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Change in y over change in x
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A unit that can be used to measure angles
Down
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A parallelogram with exactly one pair of parallel sides
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Two lines that form right angles
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One of the methods that can be used to show that triangles are congruent
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Two angles that add up to 180˚
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A parallelogram that has four congruent sides and four right angles
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A parallelogram that has 4 right angles
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The same size and shape
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Divide a segment into two congruent parts
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The place where the medians of a triangle meet
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A polygon that contains 180˚
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A parallelogram with four congruent sides
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An ancient Greek mathematician - sometimes called the Father of High School Geometry
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A method that can be used to show that something is true