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S = 20/4 = 5 cm
Da : Db = 3x : 4x
1/2Da² + 1/2Db² = S²
(3/2x)² + (2x)² = 5²
9/4x² + 4x² = 25
25/4x² =25
x² = 25 . 4/25 = 4
x = 2
Da = 3x= 6
Db= 4x = 8
jumlah = 8+6 = 14cm