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It is an expression, not an equation and so cannot be proportional nor non-proportional.
No. Area of a circle (A) is given by the formula A=(3.14128)*(d/2)2. Modifying the equation, you get: d= square root of (4A/3.14128) where d is directly proportional to the value of A and vice versa. Since there are no other variables in the equation, it's not possible for two circles to have same area but different diameter.
Directly proportional relationship is F=ma, F is directly proportional to a. Inversely proportional relationship is v=r/t, v is inversely proportional to t.
Yes. The circles can be of different size. These are called concentric circles.
Disproportional.If instead you're looking for the antonym of directly proportional, that would be inversely proportional.