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keliling = 2 (p + l)
32 = 2 (3.l + l)
32 = 2 (4l)
32 = 8.l
l = 32/8
l = 4 cm
p = 3.l
= 3 .(4)
= 12 cm
Luas = p x l
= 12 x 4
= 48 cm²