1. The problem is to understand the value of $\alpha$ given as $30$.\n\n2. Here, $\alpha$ is a variable, often used to represent an angle in degrees or radians.\n\n3. Since $\alpha=30$, it means the angle $\alpha$ measures 30 degrees.\n\n4. This is a straightforward assignment, no further calculation is needed.\n\nFinal answer: $\alpha=30$ degrees.