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d₂ = 12
L = 1/2 x d₁ x d₂
96 = 1/2 x ( 3x + 1 ) x 12
96 = 6 x ( 3x + 1 )
96 = 18x + 6
96 - 6 = 18x
x = 90/18
x = 5
96 = (3x + 1) x 12/2
96 = (3x +1) x 6
96 = 18x + 6
96-6 = 18x
90 = 18x
5. = x