A 2D movie has graphics that do not "come" out of the screen. A 3D movie's graphics seem to sort of pop out of the screen.
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A prism is 3d and a pyramid is in 2d
A net is a 2D representation of a 3D shape
2d
1. both of them have hight and width
3d + 8 = 2d - 7 3d -2d = -8 - 7 1d = - 15 d = -15