jawab semampu kalian yah.. sebelumnya terima kasih

aku mampu nomer 2
rumusnya panjang x lebar
15x20=300cm

nomer 3
rumusnya alas xtinggi
12x9 =108 cm


maaf kalo salah. aku jawab semampu ku

1.a. K = s+s+s = 4,5+7,5+5,5 = 17,5 cm
b. K = s+s+s = 8+16+12 = 36 cm
c. K = s+s+s = 25+35+20 = 80 cm
2. L = p × l = 15 x 20 = 300 cm^
3. L = a x t = 12 x 9 = 108 cm^