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Obliczam pole ΔEBF
PΔ= 1/2 ·IEBI· IBFI·sinα= 1/2·1,3 ·!,3·120/169=1/2· 13/10 · 13/10· 120/169 = 6/10
PΔ= 0,6dm²
Odp. IACI= 4,8dm, IBDI= 2dm, Obw.= 10,4dm, h= 24/13dm, PΔEFB=0,6dm²