Calculate the radius of the circle, Mathematics

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In the figure, ABCD is a square inside a circle with centre O. The Centre of the square coincides with O & the diagonal AC is horizontal of AP, DQ are vertical & AP = 45 cm, DQ = 25 cm. Find a) the radius of the circle b) si c) area of shaded region (use π =3.14 , 2 = 1.41) A C

Ans: a) 53cm
b) 39.48cm B
c) 7252.26 cm2

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