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# 4.1

### Geometry Notecards

TermDefinition
Triangle A polygon with three sides.
Scalene Triangle A triangle with no congruent sides.
Isosceles Triangle A triangle with at least two congruent sides.
Equilateral Triangle A triangle with three congruent sides.
Acute Triangle A triangle with three acute angles.
Right Triangle A triangle with one right angle.
Obtuse Triangle A triangle with one obtuse angle.
Equiangular Triangle A triangle with three congruent angles.
Interior Angles The angles on the inside of a shape. When the sides of a polygon are extended, the original angles are the interior angles.
Exterior Angles When the sides of a polygon are extended, the angles that form linear pairs with the interior angles are the exterior angles.
Triangle Sum Theorem The sum of the measures of the interior angles of a triangle equal 180 degrees.
Exterior Angle Theorem The measure of an exterior angle of a triangle, is equal to the sum of the measures of the two non adjacent interior angles.
Corollary to a Theorem A statement that can be proved easily by using the theorem.
Corollary to the Triangle Sum Theorem The acute angles of a right triangle are complementary.
Created by: GBrown99