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lsttt : 462 cm²
dit : l. pt ?
jwb : 462 : 2 × 22/7 × r × 21
: 44/7 × r × 21
: 132 × r
r : 462 ÷ 132 = 3.5
lpt : 2 x 22/7 x 3.5 x 21 + 462
: 462 + 462 = 924 cm²