How do I find the area of the shaded area if the circle's radii are 15cm and 13cm and the angle of the triangle in it is 80? What formulas do I have to use?

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How do I find the area of the shaded area if the circle's radii are 15cm and 13cm and the angle of the triangle in it is 80? What formulas do I have to use?

(3x-2y)^2

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