Section Two
Triangle Sum Theorem: The sum of the angle measures of a triangle is 180 degrees
Corollary: is a theorem whose proof follows directly from another theorem
Collaries
4-2-2 The acute angles of a right triangle are complementary
4-2-3 The measure of each angle of an equiangular triangle is 60 degrees
Interior: is the set of all points inside the figure.
Exterior: is the set of all points outside the figure.
Interior angle: is formed by two sides of a triangle.
Exterior angle: is formed by one side of the triangle and the extension of an adjacent side.
Remote interior angle: is an interior angle that is not adjacent to the exterior angle.
Exterior Angle Theorem: The measure of an exterior angle of a triangle is equal to the sum of the measures of its remote interior angles
Third Angle Theorem: If two angles of one triangle are congruent to two angles of another triangle, then the third pair of angles are congruent.
Corollary: is a theorem whose proof follows directly from another theorem
Collaries
4-2-2 The acute angles of a right triangle are complementary
4-2-3 The measure of each angle of an equiangular triangle is 60 degrees
Interior: is the set of all points inside the figure.
Exterior: is the set of all points outside the figure.
Interior angle: is formed by two sides of a triangle.
Exterior angle: is formed by one side of the triangle and the extension of an adjacent side.
Remote interior angle: is an interior angle that is not adjacent to the exterior angle.
Exterior Angle Theorem: The measure of an exterior angle of a triangle is equal to the sum of the measures of its remote interior angles
Third Angle Theorem: If two angles of one triangle are congruent to two angles of another triangle, then the third pair of angles are congruent.