solid geometry

/ˌsɑləd dʒiˌɑmətri/

In math, solid geometry is the study and measurement of three-dimensional spaces. A solid geometry problem might have you calculate the volume of a cube or sphere.

Solid geometry is also known as Euclidean geometry, named for the ancient Greek mathematician Euclid, who first described it. This system of measuring spaces expands upon the flat, 2-D forms of plane geometry. It's more complicated: in addition to lines, angles, diameter, and so on, solid geometry also accounts for volume and three-dimensional shapes like cones, pyramids, and cylinders. Geometry derives from Greek roots meaning "measurement of Earth."

Definitions of solid geometry

1. noun

   the geometry of 3-dimensional spaces
   type of:

   geometry

   the pure mathematics of points and lines and curves and surfaces