Let's rotate and redraw the figure to make it easier to understand:
The figure appears to be a right triangle with its hypotenuse and opposite side given.
Since this is a right triangle, to be able to get the measurement of the adjacent side, we will be using the Pythagorean Theorem:

The formula for the adjacent side or c is:


Let's now plug in the given values to get b.

Given: c² = 225 and a² = 145


![b\text{ = }\sqrt[]{80}\text{ = }\sqrt[]{16\text{ x 5}}\text{ = 4}\sqrt[]{5}](https://img.qammunity.org/2023/formulas/mathematics/college/2gf7gab2x5hp8sqqcrlz4rw6jagte3xkux.png)