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This question is too vague to have an answer, but here is one.

For the shaded area (pie wedge) of a circle, find the area of the circle and multiply by the ratio of the wedge angle to the entire circle (angle/360).

For the shaded region of a triangle, find the area of the smaller triangle, if necessary using trig functions to define a known angle or length of a side.

For other polygons, you may be able to divide the area into triangles separately, then sum their areas.



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Q: How do you find the Area of a shaded region?
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