The prisms as indicated in the image attached to the task content have some of their lines solid and some dashed because; the prism is a 3-dimensional figure and all sides must be represented accordingly.
What is a 3-dimensional geometric figure?
According to the task content, it follows that the prism as indicated in the image attached to the task content is a 3-dimensional figure.
Also, the solid lines represents the sides visible to the observer, while the dashed lines represents the side areas which are invisible to the observer.
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