a² = 2*12²
a = 12√(2) cm.
Where a is AC = AE.
b = 180-45
b = 135°
Where b is angle EAB.
c² = (12√(2))²+12²-24*12√(2)cos135
c = 12√(5) cm.
Where c is BE.
(12√(5)/sin135) = (12√(2)/sind)
d = 26.56505117708°
Where d is angle ABE.
e = atan(½)°
Where e is angle BCF.
f = 90+26.56505117708
f = 116.56505117708°
Where f is angle CBG.
g = 180-116.56505117708-atan(½)
g = 36.86989764584°
Where g is angle BGF.
(12/sin36.86989764584) = (h/sin116.56505117708)
h = 17.88854382 cm.
Where h is CG.
i² = 6²+12²
i = 13.416407865 cm.
It implies;
FG = 17.88854382-13.416407865
FG = 4.472135955 cm.
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