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Geometry - Act 13
| Term | Definition |
|---|---|
| Triangle Sum Theorem | The sum of the measures of angles in a triangle is 180 degrees |
| auxiliary line | when you add a line to a figure you are given for a proof |
| interior angle | angle formed by two sides of a triangle |
| exterior angle | angle formed by one side of a triangle and the extension of an adjacent side |
| remote interior angle | an interior angle that is not adjacent to a given exterior angle |
| Exterior Angle Theorem | The measure of an exterior angle is equal to the sum of the measures of its two remote interior angles. |
| Isosceles Triangle Theorem | The sum of the base angles are congruent |
| When two parallel lines are cut by a transversal, thealternate interior angles are | congruent |
| When two parallel lines are cut by a transversal, the same-side interior angles are | supplementary |
| When two parallel lines are cut by a transversal, the corresponding angles are | congruent |
| Isosceles Triangle | A triangle with at least two congruent sides. |
| coincide | correspond exactly |
| vertex angle | the angle included by the legs of isosceles triangle |
| base angle | the angle included by one leg and the base of an isosceles triangle |
| leg | one of the equal sides of an isosceles triangle |
| base | the non-congruent side of an isosceles triangle |
| altitude | segment from a vertex perpendicular to the opposite side |
| median of triangle | segment from a vertex to the midpoint of the opposite side |
Created by:
shoemaker
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