tolong pakai cara ya no 18-19 .besok di kumpulkan

17).  L= p x l
144 = 16 x l
16l = 144
l = 144/16
l = 9
K = (2 x p) + (2 x l)
K = (2x 16) + (2 x 9)
K = 32 + 18
K = 50 cm

18). Lpp = Lp
p x l = 225
25 x l = 225
l = 225/25
l = 9 cm

Kpp = (2 x p) + (2 x l)
Kpp = (2 x 25) + (2 x 9)
Kpp = 50 + 18
Kpp = 68 cm

19). Lp = Lpp
s x s = p x l
12 x 12 = 18 x l
144 = 18 x l
18 l = 144
l = 144/18
l = 8 cm