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= 2 x (1/2 x a x t) + p x l + 1/2 x a x t
= 2 x (1/2 x 10 x 10) + 3 x 10 + 1/2 x 3 x 3
= 2 x 1/2 x 100 + 30 + 1/2 x 9
= 100 + 30 + 4,5
= 134,5 m²