* Site-Outage Notice: Our engineering elves will be tweaking the Shmoop site from Monday, December 22 10:00 PM PST to Tuesday, December 23 5:00 AM PST. The site will be unavailable during this time.
Dismiss
© 2014 Shmoop University, Inc. All rights reserved.
Basic Geometry

Basic Geometry

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:

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

3D shape

Say Hello to the 3-D Shapes


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

Advertisement
Noodle's College Search
Advertisement
Advertisement
Advertisement