2d forms are flat shapes
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If it is folded out it is called a net. It forms two circles and a rectangle.
2d
The answer depends on what is known about the 2d shapes.The answer depends on what is known about the 2d shapes.The answer depends on what is known about the 2d shapes.The answer depends on what is known about the 2d shapes.
A line (2D), ray (2D), vector (2D), line segment (2D), a mobius strip (3D), or a klein bottle (3D).
The 2D equivalent of a sphere is a circle so it follows that the 2D equivalent of a hemisphere is a semicircle.