Respuesta :

Ashraf82

Answer:

r = [tex]\sqrt{\frac{A}{\pi } }[/tex]

r = 17.2 cm

Step-by-step explanation:

∵ The area of the circle A = πr²

∴ r² = A/π

∴ r = √(A/π)

∵ A = 54 cm²

∵ π = 22/7

∴ r = √(54/(22/7)) = √(54×7/22) = 17.2 cm