panjang & lebar persegi panjang berbeda 3cm, jika luasnya 180cm2, maka kelilingnya adalah..

luas = panjang kali lebar
= 15 kali 12
= 180
keliling = 2 kali ( 15 +12 )
= 54 cm
maaf yaa kalau salah

p - l = 3
p = l + 3
L = pl
180 = (l+3)l
180 = l^2 + 3l
l^2 + 3l - 180 = 0
(l-12)(l+15) = 0
l = 12
p = l + 3 = 12 + 3 = 15
K = 2(p+l)
K = 2(15+12) = 2 . 27 = 54 cm