A cylinder
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Sounds like a cylinder
A stop sign with thickness.
Since I can't attach illustrations here (can I?), I can describe one. If two congruent and parallel triangles have vertices joined by line segments, the line segments described will mark the boundaries of a solid.
A cylinder looks like a can. It has congruent circles for the bases and vertical sides that when rolled out would be a rectangle.
The lines are parallel. When a transversal intersects two lines, corresponding angles, alternate interior angles, and alternate exterior angles are congruent only if the lines are parallel. This is a fundamental property of parallel lines and transversals in geometry.