Aim : How do we identify solids ?

Solid Geometry is the geometry of 3-dimensional space.
involves width , height and length.
Volume( think how much water can fit! )
Surface Area  ( space around it )

Two Main Types .

Polyhedra - must have flat faces, polygons.
includes- prisms , platonics , pyramids etc .

Non Polyhedra - any surface with no flat surface
includes- spheres , cylinders , torus , cones .