dik=keliling 100 cm panjang =30 cm dit: lebar dan luasnya plies. jb pakek cara yh

K = 2p+2l
100 = 2.30+2.x
100 = 60+2x
100-60 =2x
40 = 2x
40÷2 = x
x = 20

L = p×l
L = 30×20
L = 600 cm²