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coplanar and do not intersect |
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do not intersect and are not coplanar |
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two planes that do not intersect |
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line that intersects two or more coplanar lines at different points |
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uses arrows to show the flow of the logical argument |
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if two lines intersect to form a linear pair of congruent angles, then the lines are perpendicular |
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if two sides of two adjacent acute angles are perpendicular, then the angles are complementary |
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Definition
if two lines are perpendicular, then they intersect to form four right angles |
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Corresponding Angles Postulate |
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if two parallel lines are cut by a trnsversal, then the pairs of corresponding angles are congruent |
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Theorem 3.4-Alternate Interior Angles |
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Definition
if two parallel lines are cut by a transversal, then the pairs of alternate interior angles are congruent |
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