tolong jawab ya,secepatnya.dengan caranya

3.
EB / DE = AB / AC
EB / 6 = (2 + EB) / 8
8EB = 6(2 + EB)
8EB = 12 + 6EB
8EB - 6EB = 12
2EB = 12
EB = 12/2
EB = 6 cm

4.
EF = (AB x DE + DC x AE) / AD
EF = (14 x 4 + 35 x 3) / 7
EF = (56 + 105) / 7
EF = 161 / 7
EF = 23 cm

3)      AC / ED = AB / EB
    8 cm / 6 cm = 2 cm + EB / EB
    8 cm x EB    = 6 cm x ( 2 cm + EB )
            8EB      = 12 + 6 EB
       8EB - 6EB = 12
                 2EB = 12 cm
                   EB = 12 cm / 2 
                   EB = 6 cm
Jadi, panjang EB = 6 cm

4) EF = AE x DC + ED x AB / AE + DE
          = 3 cm x 35 cm + 4 cm x 14 cm / 3 cm + 4 cm
          = 105 + 56 / 7
          = 161 / 7
          = 23 cm
  Jadi, panjang EF = 23 cm