∵AF? =AB? +BF?
∴BF=8cm
∴CF= 10-8=2cm
Let EC = X.
∴DE=6-x
∫EF = DE = 6-x
Right triangle CEF
(6-x)? =2? +x?
36- 12x+x? =4+x?
x=8/3
∴EC=8/3cm