sin60 = 0.5d/a
a = ⅓√(3)d units.
a is the radius of the half circle.
Therefore, total blue area in terms of d is;
2(60π*⅓√(3)d*⅓√(3)d/360)+(0.5*⅓√(3)d*⅓√(3)dsin120)-(0.5*⅓√(3)d*⅓√(3)dsin60)
= 2(πd²/18)
= ⅑πd² square units.l
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