kak tolong jawab no:10&11 sekalian pake jalan

10. Diketahui : DE = 8 cm
                        EF = BC = 20 cm
      Ditanya : Luas AFED ?
      Jawab : L = DE x EF
                      = 8 x 20 = 160 cm²

11. DE/BC = AE/AB
      DE/10 = 3/5
        5xDE = 3 x 10
         5.DE = 30
            DE = 30/5
            DE = 6 cm