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Step-by-step explanation:
area of equilateral ∆ =
[tex]( \sqrt{3} \div 4) {a}^{2} [/tex]
here a = 3
area of ∆ = 3.9 in^2
area of circle
[tex]\pi {r}^{2} [/tex]
= 19.63 in^2
area of shared region = 19.63-3.9= 15.73 in^2