From the 1st screenshot part ii of the question: My working: Vm x √2 = 28.284 x √2 = 40v (Answer Correct) I would like to ask a question from the 2nd screenshot. "Determine the effective (r.m.s) value of this voltage waveform over one complete cycle. I don't know how to solve this part. Is the 1st screenshot question which I got the answer the same method as the 2nd ? I would appreciate if someone can give some guidance to me, thanks.