nomor 17,18dan 19 y pake cara

no.18
k=2(p+l) => p+l = 54:2 = 27
x+x+3 = 27
2x+3=27
2x=27-3
2x= 24
x=12

p+3 =12+3 =15
l =12
15x12 =180

maaf cma bsa segini