echocardiogram two dimensional i.e sound produced by reflection of sound waves
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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).
2d forms are flat shapes
The 2D equivalent of a sphere is a circle so it follows that the 2D equivalent of a hemisphere is a semicircle.