Question

A rectangle is 15 inches long and 4 inches wide......

Answer 1

The width of the new rectangle is 5.6 inches

Here, we want to get the width of the new rectangle

Mathematically, when two shapes are similar, the ratio of their sides are equal

This means that the ratio of the width to the length of the first will be equal to that of the second

Let the width of the second triangle be w

We have it that;

`\begin{gathered} (15)/(4)\text{ = }(21)/(w) \\ \\ 15* w\text{ = 4}*21 \\ \\ w\text{ = }(84)/(15) \\ \\ w\text{ = 5.6 inches} \end{gathered}`