Chapter 3 Theorems
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| If two parallel lines are cut by a third plane | Then the lines of intersection are parallel
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| If two parallel lines are cut by a transversal and alternate interior angles are formed | Then they are congruent
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| If two parallel lines are cut by a transversal and same side interior angles are formed | Then they are supplementary
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| If a transversal is perpendicular to one of two parallel lines | Then it is perpendicular to the other one also
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| If two lines are cut by a transversal and alternate interior angles are congruent or if same side interior angles are supplementary | Then the lines are parallel
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| If two lines are perpendicular to the same line in a plane | Then the perpendicular lines are parallel
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| Through a point outside a line | There is exactly one line parallel to and perpendicular to the given line
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| If two lines are parallel to a third line | Then the lines are parallel to each other
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| The sum of the angles of a triangle | 180
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| The measure of an exterior angle of a triangle | Equals the sum of the measures of the two remote interior angles
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| The sum of the measures of the angles of a convex polygon | (n-2)180
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| The sum of the measures of the exterior angles of any convex polygon | 360
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