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p= 3+l
l=l
Ditanya : L
K= 2 (p+l)
54= 2 (3+l+l)
54= 2 (3+2l)
54= 6+4l
48=4l
l= 12
p= 3+l= 3+12= 15
L=pxl=15x12=180 cm2 (b)