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K = 2(pl) = 16 x 30 = 480 cm
2. Diket L = 108 cm
l = 9 cm
k = 2(pl)
p = L : l = 108 : 9
= 12
K = 2(pl) = 2(12 x 9)
= 2 x 108
= 216
Keliling = 4s = 4x17 = 68 cm
2. L = 108 cm²
l = 9 cm
L = p.l
p = L/l = 108/9 = 12 cm
K = 2 (p+l) = 2 (12+9) = 2x21 = 42 cm