Shaded Area is;
Area circle with radius 5 cm + 4(¼(area square with single side length 10 cm - area circle with radius 5 cm))
= 25π + 4(¼(100 - 25π))
= 25π + 4(25 - ¼(25π))
= 25π + 100 - 25π
= 100 cm²
A very smart approach is;
Half the area of the rectangle.
= ½(20*10)
= ½(200)
= 100 cm²
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