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Answer

Total shaded area = area of right angle triangle ABC + Semi circle with diameter AD + area of  right triangle ACD – semi circle with diameter CD

= 15 * 15/2 + 3.14 * (12.5)² + 3.14 ( 10)² – 20 * 15/2

= 112.5 + 490.87 + 314.16 – 150 

= 767.53 cm²

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