Jawabanmu

2014-05-25T19:58:08+07:00
120: 15 = 8
15 X 8 = 120
Emang kaya gitu
Kell = 2 ( p + l )
lebar (l) = 15 cm
panjang (p) 15 cm lebih dari lebar (l) , jadi :
p = 15 + l

Kell = 2 ( p + l )
120 = 2 (15 + l + l )
120 = 2 ( 15 + 2l)
120 = 30 + 4l
90 = 4l
22.5 cm = l
p = 15 + 22.5
p = 37.5 cm
L = p x l
L = 37.5 x 22.5
L = 843.75 cm2.