(related to Proposition: Prop. 10.023: Segment Commensurable with Medial Segment is Medial)
And (it is) clear, from this, that an (area) commensurable with a medial area is medial.
A medial area is equal to the square on some medial straight line. Hence, a medial area is expressible as \[\left(\frac pq\right)^{1/2},\] for some rational number $p/q$. And an area, which is commensurable with a medial area is itself medial.
Proofs: 1
Corollaries: 1
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