A sector of a cylinder, perhaps.
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Imagine a rectangle and like unfold it or make a net,that's how you call a solid shape unfolded an it is a 2-d shape but when you fold it it is a 3-d shape that's kind of an activity to do it is really fun.
A 3 dimensional triangle is called a pyramid, otherwise a 2D three sided polygon shape is exactly what you called it, a triangle.
the 2 demensional is flat and the 3 demensional shape is like a cube(it is popped out).
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