Seeing a movie in 2D is just like watching a regular movie at home. When you watch a 3D movie you have to have special glasses to watch a movie and see thing popping out of the screen.
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this is the shape of 2d cone
A 2D sphere is a circle.
it a triangle as a 2d shape
2D, a cube would be 3D
To keep it balanced, whatever you do to one side of the equals, do to the other: 2d + 7 = 9 ⇒ 2d + 7 - 7 = 9 - 7 ⇒ 2d = 2 ⇒ 2d ÷ 2 = 2 ÷ 2 ⇒ d = 1