3 Ways To Find The Third Angle Of A Triangle
180° - (3x + 24°) = 0 180° - 3x - 24° = 0 156° - 3x = 0 If one of the equal angles is 40°, then you’ll know that the other angle is also 40°. You can find the third side, if needed, by subtracting 40° + 40° (which is 80°) from 180°. 180° - 80° = 100°, which is the measurement of the remaining angle.