tolong dijawab nomor 7, makasih

a)
DE/BC = AD/AC
3/BC = 2/(2 + 6)
3/BC = 2/8
3 × 8 = 2 × BC
24 = 2BC
BC = 24/2
BC = 12

b)
FC = DE = 3

c)
BF = BC - FC
BF = 12 - 3
BF = 9

d)
EF = CD = 6