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# Question on 7th grade math (perimeter). Photo attached. I'm not sure what the answer is. Please explain.

Circumference formula of a sector =$\frac{angle}{360}$ × 2$\pi$r =$\frac{90}{360}$ × 2(2)$\pi$ =0.25 × 4$\pi$ =$\pi$ =3.1 in Answer is: A