3D Objects (Prisms, Cylinders, Cones, Spheres)

Three‐dimensional objects are the solid shapes you see every day, like boxes, balls, coffee cups, and cans.

Here are some helpful vocabulary terms for solids:

• Face: a flat side of a 3‐dimensional object.
• Base: one of two parallel, congruent sides of an object.
• Edge: the intersection of two faces on a solid object. This is a line.
• Prism: a solid object with two congruent and parallel faces.
• Pyramid: a solid object with a polygon for a base and triangles for sides.

Say Hello to the 3-D Shapes

Name	Properties	Picture
Rectangular Prism	A prism with rectangular bases. There are six faces. All faces meet at 90 degrees. Opposite faces are parallel.
Cube	A prism with six congruent faces. All faces meet at 90-degree angles. Opposite faces are parallel. It is a form of rectangular prism.
Triangular Prism	A prism with triangular bases. Only the bases are parallel.
Octagonal Prism	A prism with octagons for bases. Opposite faces are parallel.
Triangular Pyramid, aka Tetrahedron	A pyramid with a triangular base. A tetrahedron made up of four equilateral triangles is called a regular tetrahedron.
Square Pyramid	A pyramid with a square base.
Cylinder	A solid with two parallel circular bases. If you "unwrap" the middle section and lay it flat, it is a rectangle.
Cone	A solid with a circular base and a curved side that ends in one point It has one vertex.
Sphere	A solid figure where all points are an equal distance from the center point. It's a ball.