they have 4 rectangular
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A rectangular prism has six faces, and each of them is perpendicular to four others.
9 perpendicular lines
18
All of the adjacent faces are perpendicular. So there are 6 faces x 4 faces adjacent to each face So there are 24 perpendicular faces in a rectangular prism.
rectangular prism is a 3D structure with 4 lengths 4 widths 4 heights