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p = 17+l
k = 2(p+l)
118 = 2(17+ l + l)
118 = 2(17+2l )
118 = 34 + 4l
4l = 118 - 34
4l = 84
l = 21cm
p = 17 + l
= 17+ 21
= 38cm
L = p*l
= 38*21
= 798 cm²
K = 118
Panjang = 17 + l
maka :
K = 2 x (p+l)
118 = 2 x (17 + l + l)
118 = 2 x (17 + 2l)
118 = 34 + 4l
4l = 118 - 34
l = 84 / 4
l = 21 cm
maka : panjang = 17 + 21 = 38 cm
jadi :
L = p xl
= 38 x 21
= 798 cm²