The opposite side of a right-angled triangle relative to a specific angle (in this case, $x$) is the side directly opposite to that angle. Looking at the triangle in the image:

• The angle $x$ is at the bottom left of the triangle.
• The side labeled $r$ is directly across from $x$.

Thus, the opposite side relative to angle $x$ is labeled $r$.

Would you like additional details or have further questions?

Related Questions:

1. How is the opposite side defined in trigonometric contexts?
2. What are the adjacent and hypotenuse sides relative to angle $x$?
3. How does this triangle relate to sine, cosine, and tangent definitions?
4. What are the practical uses of identifying opposite sides in real-world problems?
5. How do the Pythagorean theorem and trigonometric ratios connect in a triangle like this?

Tip:

When solving trigonometric problems, always visualize the sides relative to the angle in question to prevent confusion!