A line that intersects 2 or even more coplanar lines at various points; the angles are classified by form.

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Two angles that lie on the very same side of the transversal and on the exact same sides of the other two lines - they are in the very same location on each parallel line.
Two nonnearby angles that lie on opposite sides of the transversal and between the various other lines (inner of the lines).
Two angles that lie on oppowebsite sides of the transversal and also outside the various other two lines (exterior to the lines).

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Two angles that lie on the same side of the transversal and also between the other two lines (interior of the lines).
If two parallel lines are reduced by a transversal, then corresponding angles are congruent. THIS IS BICONDITIONAL (converse is true): Corresponding Angles Converse Postulate
If 2 parallel lines are reduced by a transversal, then the alternate interior angles are congruent. THIS IS BICONDITIONAL (converse is true): Alternative Interior Angles Converse Theorem
If 2 parallel lines are reduced by a transversal, then the different exterior angles are congruent. THIS IS BICONDITIONAL (converse is true): Alternating Exterior Angles Converse Theorem
If 2 parallel lines are cut by a transversal, then the consecutive (exact same side) internal angles are supplementary. THIS IS BICONDITIONAL (converse is true): Consecutive Interior Angles Converse Theorem
Parallel lines have actually equal slopes (biconditional true: if two lines have actually equal slopes, then they are parallel)
If 2 lines are perpendicular lines then their slopes have a product of -1 (the slopes are negative reciprocals of each other) (biconditional true: if the product of the slopes of 2 lines is -1, then the lines are perpendicular)
Formula to discover the equation of a line offered the slope of the line (m) and also a allude on the line (x1, y1): y - y1 = m(x - x1)
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