Respuesta :

Answer:

12.4 cm

Step-by-step explanation:

arc AB is calculated using

arc = circumference × fraction of circle

      = 2πr × [tex]\frac{90}{360}[/tex]

      = 2π × 7.9 × [tex]\frac{1}{4}[/tex]

       = [tex]\frac{7.9\pi }{2}[/tex] ≈ 12.4 cm ( to the nearest tenth )

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