Jawabanmu

2014-05-27T21:38:13+07:00
Jadi 864 = s.s. t
864 = 12. s kuadrat
72 = s kuadrat
akar 72 = s
6 akar 2 = s
2014-05-27T21:52:16+07:00
Panjang sisi alas = 12 cm

senang bisa membantu :)