What interior angle within an anchor system results in a load equal to 100% on each leg of the anchor?

When dealing with an anchor system, the interior angle plays a crucial role in determining how the load is distributed across the anchor legs. An interior angle of 120 degrees is significant because it allows for an even load distribution, where each leg bears 100% of the load from the anchor point.

At 120 degrees, the forces acting on the legs of the anchor pull in a way that balances the loads evenly. This angle effectively creates a scenario where two vectors (the legs of the anchor) converge at a point, and the tension in each leg is equal. The geometry of the situation, described by the Law of Sines in trigonometry, shows that at this angle, the total load is symmetrically shared, leading to a straightforward calculation.

In contrast, angles smaller or larger than 120 degrees would change the load distribution, often resulting in one leg carrying more of the load than the other. For instance, a 90-degree angle can lead to increased loads on the legs because of how forces are applied, while angles larger than 120 degrees could cause the legs to pull more on the anchor point without evenly sharing the load. Hence, the choice of 120 degrees from the given options ensures that the design of the anchor