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maka :
L = 600
1/2.d1.d2 = 600
1/2.3/4 d2.d2 = 600
3/8.d2² = 600
d2² = 600:3/8
d2² = 600.8/3
d2² = 1600
d2 = √1600 = 40 cm
d1 = 3/4.40 = 30 cm