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| are coplanar lines that don't intersect. |
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| are noncoplanar lines. Therefore, they are neither parallel nor intersect. |
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| A line and a plane are parallel |
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| if they do not intersect. |
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| If two parallel planes are cut by a third plane, then the lines of intersection are parallel. |
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| A line that intersects two or more coplanar lines in different points. |
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| Alternate Interior Angles |
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| Two nonadjacent interior angles on opposite side of the transversal. |
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| Same-side Interior Angles |
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| Two interior angles on the same side of the transversal. |
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| Two angles in corresponding positions relative to the two lines. |
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| If two lines are cut by a transversal, then corresponding angles are congruent. |
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| If two parallel lines are cut by a transversal, then alternated interior angles are congruent. |
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| If two parallel lines are cut by a transversal, then same-side interior angles 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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| a closed plane figure having three sides and three angles. |
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| the highest point of something |
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| At least two sides congruent. |
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| All angles are congruent. |
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| The sum of the measures of the angles of a triangle is 180. |
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| If two angles of one triangle are congruent to two angles of another triangle, then the third angles are congruent. |
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| Each angle of an equiangular triangle has measure 60. |
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| In a triangle, there can be at most one right angle or obtuse angle. |
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| The acute angle of a right triangle are complementary. |
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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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