Jawabanmu

2014-04-11T20:36:03+07:00
Pakai rumus Pythagoras sm2 =a2+t2 """""""sm2=18 kuadrat + 12 kuadrat=324+144=468""""""""" akar dari 468 =21, 6 """""""4×1/2×18×21, 6=777, 6 cm2
2014-04-11T20:37:59+07:00