Ononot — A ternary plot displays data (a, b, c) where a+b+c=1. A line

Data Visualizationhard

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A ternary plot displays data $(a, b, c)$ where $a+b+c=1$ . A line $a=0.2$ is drawn. What is the length of this line relative to the side length $L$ of the equilateral triangle?