Given-the-following-tetra-hedral-figure-The-length-of-the-rib-is-10-cm-Find-the-area-of-triangle-DEF-

Question Number 157995 by zainaltanjung last updated on 30/Oct/21

$$\mathrm{Given}\:\mathrm{the}\:\mathrm{following}\:\mathrm{tetra}− \\ $$$$\mathrm{hedral}\:\mathrm{figure}.\:\mathrm{The}\:\mathrm{length}\:\mathrm{of}\: \\ $$$$\mathrm{the}\:\mathrm{rib}\:\mathrm{is}\:\mathrm{10}\:\mathrm{cm}.\:\mathrm{Find}\:\mathrm{the}\:\mathrm{area} \\ $$$$\:\mathrm{of}\:\:\mathrm{triangle}\:\mathrm{DEF}. \\ $$$$ \\ $$$$ \\ $$

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