(pi * radius squared) * ( sector angle / 360 )
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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.
To find the area of the circle pi*radius*squared and subtract the area of the figure inside
You will need to divide the shaded area into smaller parts, such as triangles or rectangles, or find the length of sides of these polygons.
Find the area of the shaded sector. radius of 3 ...A+ = 7.07
Base X Height - pi(r)^2