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Basic Geometry

Basic Geometry

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.

3D shape

Say Hello to the 3-D Shapes

Rectangular Prism
  • A prism with rectangular bases.
  • There are six faces.
  • All faces meet at 90 degrees.
  • Opposite faces are parallel.
rectangular prism
  • 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.
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
  • A solid with two parallel circular bases.
  • If you "unwrap" the middle section and lay it flat, it is a rectangle.
  • A solid with a circular base and a curved side that ends in one point
  • It has one vertex.
  • A solid figure where all points are an equal distance from the center point.
  • It's a ball.

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