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Lpj = Lp
Lp = s² = 400
s = √400 = 20 (B)
28) Lp = 6 × s²
8.214 = 6s²
s = √8214 : 6
s = √ 1369
s = 37 cm (D)
29) Lp = (2×p×l) + (2×p×t) + (2×t×l)
= (2×16×8) + (2×16×12) + (2×12×8)
= 256 + 384 + 192
= 832 (B)
30) Vs = 12 × (4 × 0,1 × 0,06)
= 0,288 m³
32) vol = 22/7 × 3,5dm × 3,5dm × 10 dm
= 385 dm³
= 385 ltr (B)