Parallel lines are lines in a plane that are always the same distance apart.
Conditions of Parallelism:
If two lines are cut by a transversal, then the two lines are parallel if:
a. corresponding angles are congruent.
b. alternate-interior angles are congruent.
c. alternate-exterior angles are congruent.
d. interior angles on the same side of the transversal are supplementary.
e. exterior angles on the same side of the transversal are supplementary
Perpendicular lines are lines that intersect to form right angles.
Conditions of Perpendicularity:
a. If two lines are perpendicular to each other, then they form four right angles.
b. If the angles in a linear pair are congruent, then the lines containing their sides are perpendicular.
c. If two angles are adjacent and complementary, the non-common sides are perpendicular.
Негізгі бет CONDITIONS OF PARALLELISM and PERPENDICULARITY
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