a tetrahedron is a geometric solid that has 4 sides, all trianglular - it's like a pyramid with a triaglular base.
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Four Right angles are in a solid square because a square has four sides
A four-sided solid is called a tetrahedron.
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 solid with three sides is a cylinder.
A "six sided shape" is a hexagon. The solid formed by 6 squares is a cube (four sides, top, bottom).