In the language of variation: the area A varies directly with the square of the radius r. ...and the constant of variation is k = π. This formula is an example of "direct" variation. "Direct variation" means that, in the one term of the formula, the variable is "on top”.
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In the language of variation: the area A varies directly with the square of the radius r. ...and the constant of variation is k = π. This formula is an example of "direct" variation. "Direct variation" means that, in the one term of the formula, the variable is "on top”.