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# Geometry - Act 13

TermDefinition
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