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As written, the statement is false. You can't have it both ways. I suspect you meant to write that dilating a triangle changes the size or area of the triangle but does not change its shape. That would be true.
If you mean the symbol of a triangle, in math and science a triangle stands for change in
The whole proper formula for acceleration is Δv/Δt; change in velocity divided by change in time. the triangle is the uppercase Greek letter delta, standing for "change in/of".
Usually the two triangle pieces have different pitches. So by swapping them it makes the total triangle area different. Red triangle pitch: atan(3/8) = 20.56 deg Blue triangle pitch: atan(2/5) = 21.80 deg When the blue is on the top, the total triangle bends inwards slightly, and when its at the bottom, the total bends outwards. Thus changing the area of the triangle and making room for an empty block.
In a periodic equation a triangle can be used to represent the given change of something.