Calculating Area Shaded STR (Triangle).
Let the square side be a.
tan60 = a/b
b = a/tan60 cm.
Where b is BS.
Calculating a.
2b+a = 6
2(a/tan60)+a = 6
a((2/tan60)+1) = 6
a = 6/((2/tan60)+1)
a = 6(2√(3)-3) cm.
Area Shaded STR is;
½(a²)
= ½(6(2√(3)-3))²
= 54(7-4√(3)) cm²
= 3.87702556513 cm²
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