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D1 = 4
D2???
JWB = L = 1/2 × D1 × D2
392 = 1/2 × 4 × D2
392 = 2 × D2
D2 = 392 ÷ 2 = 196
392 cm² = 1/2 . 4 . d2
392 cm² = 2 . d2
d2 = 392 cm²
2
d2 = 196