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Shapes
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curved inwards in the middle
concave
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the form of the shape that has four straight sides, two of which are usually longer than the other two, and four 90° angles at the corners
rectangular
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curved shape that is wider in the middle and pointed at the ends
crescent
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curved outwards, like the surface of the eye
convex
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having a sharp edge made of a row of connected points like teeth
serrated
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