Let r be the radius of the inscribed green semi circle.
Notice.
The ascribed triangle is equilateral.
Therefore;
sin60 = r/(0.5*7)
r = 0.5*7sin60
r = 3.0310889132 units.
Again, r is the radius of the inscribed green semi circle.
It implies, area green inscribed semi circle is;
½(πr²)
= 0.5*3.0310889132²π
= 14.4316912524 square units.
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