1. Problem: Calculate the value of an unknown angle in a triangle where two angles are given. 2. Formula: The sum of angles in a triangle is always $$180^\circ$$. 3. Explanation: If two angles are known, subtract their sum from $$180^\circ$$ to find the third angle. 4. Example: Given angles $$50^\circ$$ and $$60^\circ$$, find the third angle. 5. Calculation: $$180^\circ - (50^\circ + 60^\circ) = 180^\circ - 110^\circ = 70^\circ$$. 6. Answer: The third angle is $$70^\circ$$. This question tests understanding of angle sums in triangles, a fundamental concept in geometry.