The anchor diagram is used whenever the load is split and taken by 2 parts of the system. A two-point anchor one example of this but the diagram can be used to calculate the load on bipod legs, highlines and many other situations.

When the force is shown as a negative number it represents a compressive force such as in a tripod leg rather than a tensile (pulling) force.

Why can't you calculate a three point anchor?
How to calculate forces in a tripod
Forces in a highline system

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