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 |
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Cube |
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Triangular Prism |
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Octagonal Prism |
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Triangular Pyramid, aka Tetrahedron |
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Square Pyramid |
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Cylinder |
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Cone |
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Sphere |
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Example 1
What is the area of the base of the triangular prism below? |
Example 2
Which of the following statements about the given prism is not true? a) The two bases of the prism are congruent. |
Example 3
Which of the following shapes are pyramids? a) b) c) d) |
Exercise 1
Fill in the blank with always, sometimes, or never. A prism ____________ has parallel bases.
Exercise 2
Fill in the blank with always, sometimes, or never. A tetrahedron ___________ has 4 equilateral triangles.
Exercise 3
Fill in the blank with always, sometimes, or never. A prism ___________ has 6 faces.
Exercise 4
Fill in the blank with always, sometimes, or never. Two faces on a cone are ___________ parallel.
Exercise 5
Fill in the blank with always, sometimes, or never. In a prism, opposite faces are _________ parallel.