3²+4²+2*3*4cosa = 5²+6²-2*5*6cosa
25+24cosa = 61-60cosa
84cosa = 36
cosa = (36/84)
cosa = (3/7)
a = acos(3/7)
a = 64.6230664748°
b = 2a
b = 129.2461329497°
c² = 5²+6²-2*5*6cos64.6230664748
c = 5.9401779675 units.
Therefore, R, radius of the circle is;
sin64.6230664748 = (0.5*5.9401779675)/R
R = (0.5*5.9401779675)/(sin64.6230664748)
R = 3.2872861147 units.
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