The image depicts a right triangle with a missing side labeled as "[?]" or "x". To find $x$, we will need additional information such as the lengths of at least two sides of the triangle (e.g., the other leg and/or the hypotenuse) or angles.

Could you provide more details like the dimensions or angles of the triangle? That will allow me to calculate $x$.

Here are five related questions that could arise from solving right triangles:

1. How do you use the Pythagorean Theorem to find an unknown side of a right triangle?
2. How can trigonometric ratios (sine, cosine, tangent) help in solving for unknown sides in a right triangle?
3. What is the difference between solving a right triangle using angles versus using side lengths?
4. How does the Law of Cosines generalize the Pythagorean Theorem?
5. Can you find the area of a right triangle using only the lengths of its sides?

Tip: If you know one angle besides the right angle, you can use trigonometric functions like sine, cosine, or tangent to find the unknown sides.