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There is no such thing as a "square circle". If you mean "8 square feet", that is already the area.
Circle with a line through it is square yards, a square with a line through it is square feet
The circle is the soil in the world, and the square is a tree coming out of the soil.
A metaphor compares two objects that are different without like or as. A metaphor would be "the moon is a cookie". Kick him right square does not compare two things, so it would not be a metaphor. It seems more like an idiom, which does not mean what it is saying. For example, the idiom "Kick the bucket" means death, but a new speaker to English cannot tell because it does not mean what it literally says.
That would depend on what you mean by "five inch circle".