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Answer:
a) 379.26 cm²
b) 546.14 cm²
Step-by-step explanation:
a) Shaded Area = Area of Square of side 42 - 4*Area of the portion of circle with radius 21cm
= side² - 4*(πr²/4) = 1764 - 1384.74 = 379.26 cm²
b) Shaded Area = Area of Rectangle - Area of half circle with diameter 14
= l*b - πr²/2 = 700 - 153.86 = 546.14 cm²
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