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K= 2p + 2l
84= 2(5x) + 2(2x)
84= 10 x + 4 x
84 = 14 x
x = 6 cm
Panjang = 5x =5 x 6= 30 cm
Lebar = 2x =2 x 6=12 cm
84=2x5y+2x2y
84=10y+4y
84=14y
84:14=y
6=y
p=5y=5x6=30
l=2y=2x6=12