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d1 = 12 cm
d2 = x+4
L = 84 cm
maka :
L = (d1xd2) / 2
84 = (12 x (x+4))/2
2x84 = 12x + 48
168 = 12x+48
12x = 168-48
x = 120/12
x = 10 cm
jadi x = 10 cm
d₂ = x + 4
L = 84 cm²
L = 1/2 x d₁ x d₂
84 = 1/2 x 12 x (x + 4)
84 = 6 x (x + 4)
84 = 6x + 24
6x = 84-24
6x = 60
x = 60/6
x = 10
Nilai x = 10 cm