The area of a rectangular red sticker is 45 square millimetres. It is 9 millimetres wide. How tall is it?

1. ### Break Down the Problem

We are given:

• Area of the rectangle (A) = 45 square millimeters
• Width (w) = 9 millimeters We need to find the height (h) of the sticker.

2. ### Relevant Concepts

The formula for the area of a rectangle is: $A = w \times h$ where $A$ is the area, $w$ is the width, and $h$ is the height.

3. ### Analysis and Detail

To find the height, we can rearrange the formula: $h = \frac{A}{w}$ Now substituting the known values into the equation: $h = \frac{45 \text{ mm}^2}{9 \text{ mm}}$

4. ### Verify and Summarize

Calculating the height: $h = 5 \text{ mm}$ Thus, the height of the rectangular red sticker is 5 millimeters.

Final Answer

The height of the sticker is 5 millimeters.