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An entire circle is 360 degrees. 90 deg is 1/4 of that.

Area of a circle is A = pi r^2

area of this sector is (1/4) pi r^2 = (1/4) x 3.14 x 4x4 =12.56

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Q: What is the area of the shaded sector if the circle has a radius of 4 and the central angle is 90 degrees?
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