Asquare is inscribed in a circle of diameter 12 millimeters. what is the area of the shaded region? recall that in a 45 – 45 – 90 triangle, if the legs each measure x units, then the hypotenuse measures the square root of x units. a (72π – 144) mm2 b (72π – 72) mm2 - c (288π – 288) mm2 - d (288π – 144) mm2