Question: Solve for $b$.
30°
125°
b
b = [?]°
1. **State the problem:** We are given a triangle with angles $30^\circ$, $125^\circ$, and $b$, and we need to find the value of $b$.
2. **Recall the triangle angle sum rule:** The sum of the interior angles of any triangle is always $$180^\circ$$.
3. **Set up the equation:**
$$30^\circ + 125^\circ + b = 180^\circ$$
4. **Add the known angles:**
$$155^\circ + b = 180^\circ$$
5. **Isolate $b$ by subtracting $155^\circ$ from both sides:**
$$b = 180^\circ - 155^\circ$$
6. **Calculate the value:**
$$b = 25^\circ$$
**Final answer:**
$$b = 25^\circ$$