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72 = 8 + ?
L = 72 : 8
= 9
jadi luas persegi pnjang adalah 9
72 : 2 x (8 + l)
l : 72 : 2 - 8
: 36 - 8
: 28 cm
L : p x l
: 8 x 28
: 224
Kalo bingung tanya aja!