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2(p+l) = 100
p+l = 50
Dengan,
Lebar = x
Panjang = 3x
Maka,
p+l = 50
x+3x = 50
4x = 50
x = 12,5
Maka:
Panjang = 37,5 m
Lebar = 12,5 m
Maka,
Luas = pl
Luas = 37,5 x 12,5
Luas = 468,75 m²
p=3l
x=p
menggunakn metode keliling
K=2(p.l)
100=2(3l+l)
100/2=4l
l=12,5
jadi p=3l
p=12,5.3
p=37,5
L=12,5.37,5
L=468,75