Understanding Three-Dimensional Figures: Identifying Parts and Terminology

This lesson covers the identification of parts of three-dimensional figures, including faces, bases, vertices, edges, and height. It begins with an explanation of dimensions, distinguishing between one-dimensional, two-dimensional, and three-dimensional figures. The lesson then defines key terms such as faces, edges, vertices, and prisms, using examples like pentagonal and triangular prisms. The concept of height in prisms is also explained, emphasizing its perpendicularity to the base. The lesson concludes with a recap of the parts of 3D figures.

What is a characteristic of a two-dimensional figure?

• It has length, width, and height.

• It has only length.

• It has length and width.

• It has no dimensions.

In a three-dimensional figure, what is a face?

• A point where edges meet.

• A line where two surfaces meet.

• A flat surface on the figure.

• The height of the figure.

What is the term for the point where three edges meet in a 3D figure?

• Vertex

• Base

• Face

• Edge

Which of the following is true about a prism?

• It has only one base.

• It has two parallel congruent polygonal bases.

• It is a two-dimensional figure.

• It has no edges.

How is the height of a prism defined?

• As the length of its longest edge.

• As the distance between its bases.

• As the number of its vertices.

• As the width of its base.