cos15 = 12/a
a = 12.42331416492 cm.
Where a is the side length of the inscribed regular triangle.
Radius, r of the inscribed circle is;
tan30 = r/(0.5* 12.42331416492)
r = 3.58630188867 cm.
Area Circle is;
π(3.58630188867)²
= 40.40578629489 cm²
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