Well, without knowing what the two solid figures are and what the real life figure is, you cannot solve it as far as I know. That's all I've got.
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Just look at the house we are in,the solid figures play a key role in building the house. Look at the desk,the ball,the table,the cup,so many things in our life,they are designed by solid figures first.we can say,it is the solid figure make our life more artistical.
You can make square pyramid.
a rectangle or square
area
You can always slide and flip any figure that you want to. But that will not make them the same.