All sides in a triangle is equal to 180° So whenever given two sides only, add them up, and subtract from 180. That will give you the missing sides length. So 23 + 84 = 107 180 - 107 = 73 The missing side of the triangle is equal to 73°.
110 + 42 = 152 152 - 180 = 28° The missing side of the triangle is equal to 28°.
Another example is: 100°, 40° Front the missing side in this triangle. 100 + 40 = 140° 180 - 140 = 40° The missing length is 40°
