Jawabanmu

2014-04-20T18:42:47+07:00
ΔABC = Δ DEF
AC = ED
AB = EF = 15
CB = DF = 17

Mencari sisi AC = √17²-15²
                        = √289-225
                        = √64 = 8
Luas ΔDEF = 1/2 x alas x tinggi
                  = 1/2 x 15 x 8
                  = 60
1 5 1
2014-04-20T19:17:31+07:00