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K = 2p+2l
60 = 2l + 12cm + 2l
60 -12 = 4l
4l = 48
l = 12
maka :
p = l + 6cm = 12 +6 = 18cm
l = 12cm
jadi :
L = pxl
= 18 x 12 = 216 cm^2
p = l + 6cm
K = 2 x p + 2 x l
60 = 2 l + 12cm + 2l
60 -12 = 4 l
4l = 48
l = 12
maka selanjutnya:
panjang = l + 6cm = 12 +6 = 18cm
lebar = 12cm
jadi :
L = pxl
= 18 x 12 = 216 cm2