Download More Properties of Triangles The Third

Name: ________________________________
Date: ________________________
More Properties of Triangles
The Third-Angle Theorem:
If two angles of one triangle are congruent to two angles of another triangle, then the third
angles in each triangle are ___________.
The Opposite Parts Theorems:
In a triangle, the largest side is opposite the __________ angle, the middle side is opposite
the __________ angle, and the smallest side is opposite the __________ angle.
In a triangle, the largest angle is opposite the largest side, the middle angle is opposite the
middle side, and the smallest angle is opposite the smalles side.
Triangle Inequality:
The sum of any two sides of a triangle must be _______________ than the length of the 3rd
side.
Exterior Angle of a Triangle: An angle that is formed by extending one side of a triangle.
The exterior angle is outside of the triangle and is
__________ _______ with one of the interior angles.
The Exterior Angle Theorem:
The measure of the exterior angle of a triangle is equal to the _______ of the
measures of the __________ interior angles.