when two waves, one as a crest, one as a trough meet in the middle, a destructive interference happens right? then if you have a semicircle on top and a smaller semicircle at the bottom, what would the resultant wave look like? I know that you have to take the height of the smaller semicircle out from the top but then when i do this, i just get a shape where a chunk of the smaller semicircle is bitten out of the bigger semicirle at the top. but it isn't supposed to be like this. I know that just taking the exact shape out of the top applies only when the wave is a rectangle. Can anyone plz help me as to what my resultant wave should look like??