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48 = 2(16 + l)
48 = 32 + 2l
16 = 2l
l = 8cm
Luas = p x l = 16 x 8 = 128cm²
3. luas = s x s
144 = s²
√144 = s
12cm = s
Kllng = 4 x s = 4 x 12 = 48cm