Calculating BC.
(BC/sin30) = (12/sin75)
BC = 6.21165708246 cm.
Calculating EF.
(6.21165708246/sin75) = (EF/sin30)
EF = 3.21539030917 cm.
Angle FEG is;
360-2(75)-60
= 360-210
= 150°
It implies;
Area triangle EFG is;
0.5*3.21539030917*3.21539030917sin150
= 2.58468371008 cm²
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