Jawabanmu

2014-04-01T19:28:24+07:00
Kll = 2*(p+l) =2*(24+18) =2*42=84 bnyk tiang =84:3=28
2014-04-01T19:28:24+07:00
= keliling / 3
= 2 (24+18)/3
= 84/3
= 28