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.
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.
| |
Hexagonal Prism | - A prism with hexagons 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.
| |
3d Objects (prisms, Cylinders, Cones, Spheres) Practice:
Fill in the blank with always, sometimes, or never. A prism ____________ has parallel bases.
Fill in the blank with always, sometimes, or never. A tetrahedron ___________ has 4 equilateral triangles.
Fill in the blank with always, sometimes, or never. A prism ___________ has 6 faces.
Fill in the blank with always, sometimes, or never. Two faces on a cone are ___________ parallel.
Fill in the blank with always, sometimes, or never. In a prism, opposite faces are _________ parallel.