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(30 x 18 ) / 2  =  270

aire zone de jeux  = 270 m²

80 m² = 1 sac

270 m² = 3.375 = 4 sacs

4 x 8.35 = 33.4

AT/AC = AS/AB = TS/CB

30/40 = 18 /CB

CB = 24  m

( 40 x 24 ) / 2 =  480

aire totale  = 480 m²

aire skatepark =  480 -  270  =  210 m²  

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