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d1 : d2 = 3x : 5x
L = 1/2 (d1 X d2)
450 = 1/2 (3x X 5x)
900 = 15 x²
60 = x²
√60 = x = 2√ 15 cm
d1 = 3x = 6 √15 cm
d2 = 5x = 10 √15 cm