How many faces does a closed rectangular prism have?
- Count two bases and four side faces.
- A closed net has six rectangles; a lidless container has five faces.
Nets & views of 3-D objects
Imagine folding and unfolding a solid.
A net unfolds the surface
Connect faces in a valid net to the solid and distinguish top, front and side views.
A net is a connected arrangement of faces that folds into a solid without gaps or overlaps. For a closed prism every face appears exactly once.
Explore the dimensions
Predict first, then change one dimension. Diagrams are schematic; results use the entered values. Rounded values are marked ≈.
Track the edges
Edges that meet when folded must have equal lengths. Opposite rectangular-prism faces are congruent, but many different arrangements can make a valid net.
Views show one direction
A front, top or side view is a two-dimensional projection. It can hide depth, so more than one view may be needed to identify a solid.
Worked examples
A cube has edges of 3 cm.
- Each square face has area 3 × 3 = 9 cm².
- Six faces cover 54 cm² in total.
Guided Practice
A rectangular box has no lid. How many faces appear in its net?
A first hint
Count the bottom and the walls.
Compare your reasoning
Five: one bottom and four side faces.
Practice
Fresh questions · useful feedback
Build fluency, one decision at a time.
Work through eight questions. Two independent correct answers introduce a harder version; supported answers bring the next question back to the foundation. You can use hints at any time.
0 of 8 questions completed
This round saves on this device. It is practice, not a school mark.
Connections
Sketch two different cube nets and explain how you checked the folds.
Videos & Explorations →