To calculate reaction forces in equilibrium problems, one must apply the principles of static equilibrium, ensuring that the sum of forces and the sum of moments around a point are both zero. The discussion references a specific exam question, indicating that the answer key suggests a distance of 1.6m, but clarification on the solution is sought. It is noted that when the structure tips, the reaction force at support A will decrease, potentially leading to a complete loss of support if tipping continues. Understanding the distribution of forces and the effects of tipping is crucial for solving these types of problems. Mastery of these concepts is essential for accurately determining reaction forces in various engineering scenarios.