1. The problem is to understand how to solve problems involving a right angle, typically in geometry or trigonometry. 2. In a right angle triangle, one angle is exactly $90^\circ$. 3. The Pythagorean theorem is fundamental: $$a^2 + b^2 = c^2$$ where $a$ and $b$ are the legs and $c$ is the hypotenuse. 4. To find a missing side, rearrange the formula accordingly. 5. For example, if you know $a$ and $b$, calculate $c$ by $$c = \sqrt{a^2 + b^2}$$. 6. If you know $c$ and one leg, say $a$, find the other leg $b$ by $$b = \sqrt{c^2 - a^2}$$. 7. Trigonometric ratios (sine, cosine, tangent) also help: $$\sin(\theta) = \frac{\text{opposite}}{\text{hypotenuse}}, \cos(\theta) = \frac{\text{adjacent}}{\text{hypotenuse}}, \tan(\theta) = \frac{\text{opposite}}{\text{adjacent}}$$. 8. These formulas allow you to solve for unknown sides or angles in right triangles.