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No, it is not. A quadrilateral is a 4-sided polygon. A triangle is a 3-sided polygon. Therefore, whatever way you turn it, a triangle will never be a quadrilateral.
I don't know which way you are picturing it, but I think that you're either on about the star of david or a triforce
Take a pyramid and turn it upside down so it is balanced on the point (pointed top), you have now turned a 3D shape upside down. Basically, upside down is to reverse the way the shape should normally appears.
Take a pyramid and turn it upside down so it is balanced on the point (pointed top), you have now turned a 3D shape upside down, vertically. Basically, upside down is to vertically reverse the way the shape should normally appears.
You have broken down on a two-way road. You have a warning triangle. You should place the warning triangle at least how far from your vehicle?