This is a coaster. The corners of the coaster forms 90 degree angles. Two 90 degree angles put together form a 180 degree angle. This means that they are suplementery. I found this coaster in my living room. A coaster is used two keep condensation from cold drinks from making stains on a wooden table. I took this picture myself. This is an exmple of the food industry because it is used to hold food.
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