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3 : 1
untuk mengetahui nilainya, misal
3x : 1x
K= 2 (p+l)
90 = 2 (3x + 1x)
90:2= 4x
45= 4x
45:4 = x
x = 11,25
masukkan.ke.permisalan
p : l
3x : 1x
3(11,25) : 11,25
33,75 : 11,25
bulatkan
34 : 11
jadi, p=34 cm dan l=11 cm
maka
L=p x l
= 34 x 11
= 374 cm persegi