Answer:
Dimension of a space is roughly defined as the minimum number
of coordinates needed to specify every point within it. A
line is onedimensional, a plane is twodimensional, and the
space we live in is threedimensional.
A shape drawn in a plane is said to be twodimensional, but
a solid such as a sphere or a pyramid needs a third dimension
to exist, so is called threedimensional.
