Let $Q$ be any convex quadrilateral of area $F$ and semiperimeter $s$.
Suppose that length of any diagonal of $Q$ $ \geq$ length of any side of $Q$ $\geq 1$
How prove $ \frac{2}{\sqrt3}F \geq s-1 $?
2026-03-26 04:53:46.1774500826
How prove $ \frac{2}{\sqrt3}F \geq s-1 $ for convex quadrilateral?
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