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= ( ¾ x 3,14 x (20/2)²) + ( ½ x 14 x (26 - (20/2)))
= ( ¾ x 3,14 x 10² ) + ( 7 x ( 26 - 10))
= ( ¾ x 3,14 x 100 ) + ( 7 x 16 )
= ( 3/4 x 314 ) + 112
= 235,5 + 112
= 347,5 Cm²