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firstly take out are of the 2 triangles ACB and ADB then add them and then take out it's area and subtract it from whole area
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ar of shaded region = ar of circle - 2×(ar of right triangle)
angle c and angle d are in the semicircles so they are 90 degree angles tht makes triangle acb and adb a right angle triangle.
just write down the formula as ive mentioned above and substitute the values. if u dont understand u can ask me ill edit my answer for u.
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