At least one of the sides must be curved for a two sided shape. If the curved shape is part of a circle you will have shapes like a segment of a circle, a crescent or a convex lens. The types of shapes can be increased greatly if the curved side can be elliptic, or even better, just a wobbly line.
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Hemisphere.
A ten-sided polygon is called a decagon.
You can't make a 4 sided shape with a total of 207
12-sided two dimensional shape: dodecagon12-sided three dimensional shape: dodecahedron
how do you draw a trapezoid two ways