Area blue is;
Area square with side 10 cm - Area quarter circle with radius 10 cm - Area square with side 5 cm + Area quarter circle with radius 5 cm.
= (10*10) - (¼*10*10*π) - (5*5) + (¼*5*5*π)
= 100 - 25π - 25 + ¼(25π)
= 75 - 25π + ¼(25π)
= ¼(300 - 100π + 25π)
= ¼(300-75π) cm²
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