Tolong dijawab ya kaka..

Panjang = 10 cm
perbandingan panjang:lebar = 5:1
maka lebar = 10/5 x 1 = 2 cm
keliling = 2(p+l)
= 2(10+2)
=2(12)
= 24 cm

P:l=5:1
10:l = 5 : 1
p= 10 cm
l=10/5=2=1×2=2
k=2(p+l)=2(10+2)=2(12)=24