A solid with three sides is a cylinder.
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Triangle
2 dimensional (plane) figures can have three or more straight edges as sides. 3 dimensional (solid) figures can have four or more plane sides (faces). They can have fewer sides if the sides are not straight.
a cube
a tetrahedron is a geometric solid that has 4 sides, all trianglular - it's like a pyramid with a triaglular base.
An 'oblate' is a 3-dimensional solid that resembles a ball that is being pushed together a little bit from two opposite sides.