Three dimensional figure (solid geometry)
Three dimensional figure (solid geometry)
Solid geometry is the traditional name for the geometry of threedimensional Euclidean space.
Stereometry deals with the measurements of volumes of various solid figures (threedimensional figures) including pyramids, prisms and other polyhedrons; cylinders; cones; truncated cones; and balls bounded by spheres.
Basic topics in solid geometry and stereometry include

incidence of planes and lines

dihedral angle and solid angle

the cube, cuboid, parallelepiped

the tetrahedron and other pyramids

prisms

octahedron, dodecahedron, icosahedron

cones and cylinders

the sphere

other quadrics: spheroid, ellipsoid, paraboloid and hyperboloids.
Video: Two dimensional and Three dimensional shapes
Techniques
Various techniques and tools are used in solid geometry. Among them, analytic geometry and vector techniques have a major impact by allowing the systematic use of linear equations and matrix algebra, which are important for higher dimensions.
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