A

9000002910

Level: 
A
Consider a rectangle with area of \(5\, \mathrm{cm}^{2}\). Find the formula which relates side \(a\) to the side \(b\) of this rectangle.
\(b = \frac{5} {a}\), \(a\in (0;\infty )\)
\(b = 5a\), \(a\in (0;\infty )\)
\(b = \frac{10} {a} \), \(a\in (0;\infty )\)
\(b = \frac{25} {a} \), \(a\in (0;\infty )\)