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#### solids

Geometric shapes in three dimensions that are delimited by surfaces.
#### helix

Volume or solid of spiral shape that turns toward the left at a constant angle.
#### cylinder

Volume or solid generated by the rotation of a straight line (generatrix) moving along a curved line (directrix).
#### regular octahedron

Volume or solid with eight triangular sides of equal area; it has six vertices and 12 edges.
#### parallelepiped

Volume or solid with six sides (parallelograms) that are parallel in pairs.
#### cube

Volume or solid with six square sides of equal area and six equal edges; it has eight vertices.
#### pyramid

Volume or solid generated by straight lines (edges) connecting the angles of a polygon (base) to the vertex and whose sides form triangles.
#### cone

Volume or solid generated by the rotation of a straight line (generatrix) along a circular line (directrix) from a fixed point (vertex).
#### torus

Volume or solid generated by the rotation of a circle at an equal distance from its center of rotation.
#### sphere

Volume with all the points on its surface the same distance from its center; the solid thus delimited is a round ball.
#### hemisphere

Half sphere cut along its diameter.