If a triangular electric car battery has three sides and three angles with one angle at 90 degrees( Angle A), one angle at 40 degrees( Angle B) and one angle at 50 degrees( Angle C), what is the total sum of all the angles? We know that all angles must add up to 180 degrees so what is the answer if we add Angle A to Angle B and Angle C? If angle A is 70 degrees and Angle C is 30 degrees, what is Angle B?