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9 x 12/2
9 x 6 = 54 cm²
L trapesium 1 = 67,5 cm²
( 9 + 18 ) x 5 : 2
27 x 5 : 2
135 : 2
= 67,5 cm²
L trapesium 2 = 252 cm²
( 9 + 33 ) x 12/2
42 x 6
= 252 cm²
54 cm² + 67,5 cm² + 252 cm²
= 373,5 cm²