click below
click below
Normal Size Small Size show me how
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 |