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OA = Side of square = 20 cm
OB = Diagonal of square = 202 cm = Radius of the quadrant.
Solution to Q 13 Exercise 12.3 NCERT Class X.
Area of shaded region = Area of quadrant - Area of square,
= π(OB)2/4 - OA2
= (3.14)(20x20x2)/4 - 202
= 228 cm2