a..
K=2×(p+l)
90=2×(p+l)
p+l=90/2=45
27+l=45...
l(lebar)=45-27
l=18 m
b..
L = p×l
L = 27m×18m
L = 486 m2
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a..
K=2×(p+l)
90=2×(p+l)
p+l=90/2=45
27+l=45...
l(lebar)=45-27
l=18 m
b..
L = p×l
L = 27m×18m
L = 486 m2