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2(p + l) = K
2((l + 6) + l) = 60
2(l + 6 + l) = 60
2(2l + 6) = 60
4l + 12 = 60
4l = 60 - 12
4l = 48
l = 12
p = l + 6
= 12 + 6
= 18 cm
L = p × l
= 18 cm × 12 cm
= 216 cm²
k = 2(p+l)
60 = 2 (x+6+x)
60 = 2 (2x+6)
60 = 4x + 12
60 - 12 = 4x
48 = 4x
x = 48 : 4
x = 12
jadi, p = 12 , l = 12 +6 = 18
L = p × l
= 12 × 18
= 216 cm2