TRIANGLE ANGLE SUM THEOREM
Measurement of Angle A + Measurement of Angle B + Measurement of Angle C = 180 degrees
TRIANGLE EXTERIOR ANGLE THEOREM
The measurement of the exterior angle is equal to the sum of the two remote interior angles of the triangle.
HINGE THEOREM
The largest angle of a triangle is opposite to the largest side of the triangle.
Conversely, the smallest angle of the triangle is opposite the smallest side of the triangle.
Conversely, the smallest angle of the triangle is opposite the smallest side of the triangle.