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20 Cards in this Set
- Front
- Back
- 3rd side (hint)
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From a point not on a given line... |
there is exactly one line perpendicular to the given line. |
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Through a point not on a line... |
exactly one line is paralle to the given line. |
Parallel Postulate |
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If two paralle lines are cut by a transversal... |
Then the pairs of alt. Int. <s are congruent. |
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If two parallel lines are cut by a transversal... |
Then the pairs of corr. <s are congruent. |
Postulate |
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If two parallel lines are cut by a transversal... |
Then the pairs of alt. ext. <s are congruent. |
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If two parallel lines are cut by a transversal... |
Then the pairs of int. <s on the same side of the trans. are supp. |
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If two parallel lines are cut by a transversal... |
Then the pairs of ext. <s on the same side of the trans. are supp. |
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If two lines are cut by a transversal so that two corr. <s are congruent... |
Then these lines are parallel. |
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If two lines are cut by a transversal so that two alt. int./ alt. ext. <s are congruent... |
Then these lines are parallel. |
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If two lines are cut by a transversal so that... |
Two int. <s or two ext. <s on the same side of the trans. are supplementary, then these lines are parallel. |
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If two lines are each parallel to a third line... |
Then these lines are parallel to each other. |
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If two coplanar lines are each perpendicular to a third line... |
Then these lines are parallel to each other. |
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If two lines are cut by a trans. So that... |
Two corr. <s are congruent, then these lines are parallel. |
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In a triangle, the sum... |
Of the measures of the int. <s is 180°. |
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Each < of an equilateral triangle... |
Measures 60°. |
Corollary |
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The acute <s of a rt. triangle... |
Are comp. |
Corollary |
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If two <s of one triangle are congruent to two <s of another triangle... |
Then the third <s are also congruent. |
Corollary |
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The measure of an ext. < of a triangle equals... |
The sum of the measures of the two non-adjacent int. <s. |
Corollary |
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When the sides of a triangle are extended, each angle that is formed... |
By a side and an extension of the adjacent side is an ext. < of the triangle. |
Fact |
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Vertex |
A point where two lines or line segments meet. |
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