tolong jawabannyaa.. 25 POIN

keliling = 2 x p + 2 x l
kel. = 2 x p + 2 x ⅓p
56 = 2p + ⅔p
56 = 8/3p
p = 56 : 8/3
p = 21

lebar = ⅓p = ⅓ x 21 = 7

luas = p x l
= 21 x 7 = 147cm²