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24 = at/2
24 = (2x+2)(2x)/2
48 = 4x²+4x
= 4x²+4x-48 = 0
x²+x-12 = 0
(x-3)(x+4) = 0
x = 3 atau x = -4
Keliling = 6+10+8 = 24 cm