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First Semester Vocabulary Geom

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