What are parallel lines in a plane?, Lines that never meet, Lines that meet at one point, Lines that cross at a right angle, What is a transversal line?, A line segment with no endpoints, A point between two lines, A line that cuts across two other lines, How many angles are formed when a transversal crosses two distinct lines at distinct points?, 2, 8, 4, How many pairs of corresponding angles are formed by a transversal crossing two lines?, 8, 2, 4, When two parallel lines are cut by a transversal, how are corresponding angles related?, They are always different., They always sum to 90°., They are equal., When two parallel lines are cut by a transversal, how are alternate interior angles related?, They are always different., They always sum to 90°., They are equal., What is another name for vertical angles?, Corresponding angles, Vertically opposite angles, Alternate interior angles, What is a theorem?, An untested guess, A mathematical statement that can be proved true, A personal opinion, In an if-then theorem, what is the if part called?, The conclusion, The proof, The hypothesis, What do we use to prove a theorem?, Logic and known facts, A guess alone, An opinion alone

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