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K = 34 cm
Panjang = 7 + l
maka :
K = 2 x (p+l)
34 = 2 x (7+l + l)
34 = 2 x (7+2l)
34 = 14 + 4l
4l = 34-14
l = 20/4
l = 5 cm
jdi :
lebar = 5 cm
panjang = 7 + 5 = 12 cm
34 = 2(7+l) + 2l
34 = 14 + 2l + 2l
34 = 14 + 4l
4l = 34 - 14
4l = 20
l = 20/4
l = 5
Maka;
Lebar = 5 cm
Panjang = 7 + l = 7 + 5 = 12 cm