Technical Editor at Maker Media. Sometimes Scientist. Builder of things. Maker of stuff.
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Assume that it bends into an arc when heated. Substances expand when we increase their temperature. Different substances expand differently, that is why there will be the difference in the length of the two strips.
You can easily create curves and bends in flat acrylic or plexiglass sheets for your models or miniatures. The tutorial which follows shows how you can make bends with a simple jig and common heat sources. The difficulty with small projects, having tight bends close together, is control of the heat source so the adjoining curve isn't affected.