Respuesta :

For this problem we use the formula to find the area of a sector:

[tex]A=\text{ }\pi r^2\cdot\text{ }\frac{\alpha}{360}[/tex]

Substituting

[tex]A=\text{ }\pi(12)^2\cdot\text{ }\frac{90}{360}=\text{ 36}\pi[/tex]

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