Discussion
A square prism of 40 mm side develops laterally as a rectangle whose length is
Answer: A
Correct answer: 160 mm
The lateral development of a prism is a rectangle whose length is the perimeter of the base: \[ 4 \times 40 = 160\ \mathrm{mm}. \] The four faces are laid side by side, and the fold lines between them are the vertical edges of the prism.
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