Calculation r, radius of the circle.
a = 45+30
a = 75°
a is angle ECF.
b² = (4√(6))²+6²-2*6*4√(6)cos75
b = 10.0781555545 units.
b is EF.
c = ½(b)
c = ½(10.0781555545)
c = 5.03907777727 units.
It implies r, radius of the circle is;
sina = c/r
r = 5.03907777727/sin75
r = 5.21683719404 units.
Again, r is the radius of the circle.
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