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Verified answer
P : l = 4:3K =2(p+l)
=2(4a+3a)
=2( 7a)
=14a
14a=420
a=30
p=4a=4(30) =120 m
l=3a=3(30) = 90 m
Luas = pl
=120 x 90
=10.800 m²