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56 = 2( 6 + l ) + 2l
56 = 12 + 2l + 2l
56 = 12 + 4l
4l = 56 - 12
= 44
l = 44 : 4
= 11 cm
p = l + 6
= 11 + 6
= 17 cm
Luas = P x L
= 17 x 11
= 187 cm²
Jadi, luas persegi panjang tersebut adalah 187 cm²
p = x+6
Kll = 2(p+l)
56 = 2(x+x+6)
56 = 2x + 2x + 12
56 = 4x + 12
4x = 56 - 12
4x = 44
x = 44/4
x = 11
lebar = 11
panjang = 11 + 6 = 17
Luas = panjang x lebar
= 17 x 11
= 187
jadi luas persegi panjang adalah 187 cm²