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The definition of a rectangle is a quadrilateral with four 90 degree angles, which is not always a square. The definition of a square is a quadrilateral with four 90 degree angles and all sides congruent, which is always a rectangle.
They are ALWAYS coplanar! This is because the definition says so! You have to read it first, in order to get the answer!
Yes, by definition.
You always double the number.
Yes it is. That is the definition of rational numebrs.