7² = 5²+6²-2*5*6cosa
60cosa = 25+36-49
cosa = (61-49)/60
a = acos(12/60)
a = 78.4630409672°
Calculating r, radius of the inscribed half circle.
5r+6r = 5*6sin78.4630409672
11r = 30sin78.4630409672
r = (30sin78.4630409672)/11
r = 2.6721706285 units.
Again, r is the radius of half the inscribed circle.
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