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54 cm :2= 27 cm..
27 cm-3= 24cm
24cm:2=12cm...
panjangnya 12cm+3=15cm
lebarnya 12cm
luasnya adalah.. panjang×lebar
15cm×12cm = 180 cm™
54 = 2 (l+3+l)
54 = 2 (2l +3 )
54 = 4l+6
54 - 6 = 4l
48 = 4l
l = 12
p = l+3
= 12 + 3
= 15
L = 15 x 12
= 180