A net
When a triangular prism is unfolded, it forms a flat shape resembling a net composed of two triangular faces and three rectangular faces. The two triangles are positioned at opposite ends, while the rectangles connect the corresponding sides of the triangles. The overall layout looks somewhat like a combination of a triangle and three adjoining rectangles, creating a shape that can be folded back into the original prism.
Six rectangles. Three pairs of congruent rectangles. Imagine a standard box unfolded. The two ends are the same, the sides are the same and the top and bottom are the same.
It is called a cuboid.
It could be called a square prism but a more common name would be a cuboid.
It is simply called a pentagonal prism. That is a prism based on the 2D shape known as a pentagon.
It could be called a pentahedral prism.
Hexagonal Prism
heptagonal prism
It is called an octagonal prism
pentagonal prism
pentagonal prism
Six rectangles. Three pairs of congruent rectangles. Imagine a standard box unfolded. The two ends are the same, the sides are the same and the top and bottom are the same.
A pyramid with 18 edges would be called a nonagonal pyramid. A prism with 18 edges is called a hexagonal prism.
"unfolded" is the simple predicate. "unfolded a large quilt" is the complete predicate.
An octagonal prism.
It is a Triangular Prism.
It is called a cuboid.