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Solution is given in the attachment below-:
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area of not shaded part = πr²/2 + πr²/2 + 4 x 20
= 44/7 + 44/7+ 80
= 88 + 560 /7
= 648/7
area of shaded region = 26 x 12 - 28160/7
314 - 648/7 = (2198 - 648)/7 = 221.4 m²
please check calculation again.
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