possibly the baseboards on the bottoms of the walls where the carpet meets a wall, a knife which is actually two inclined planes, and a salad fork with is arrow shaped where the poking part of the fork is which is also two inclined planes, a face of a square shaped lampshade.
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example of inclined plane
tati poo and wedges
examples of wedge
knife
A ramp, hill, and a slide. ~<>~<>~<>~<>~<>~