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= 5a : 3a
Keliling = 80cm
80cm = 2 x ( P+L )
= 2 x ( 5a + 3a )
= 2 x (8a)
= 16a
a = 80 : 16 = 5
panjang = 5a = 5(5) = 25cm
lebar = 4a = 4(5) = 20cm