If `triangle ABC cong triangle DEF` then
`angle BCA =`_______

If triangle ABC cong triangle DEF then angle EDF = ________

If triangle ABC cong triangle DEF then angleE = ______

For triangle ABC cong triangle ACB , then

If triangle ABC cong triangle DEF then BC = ________

If triangle ABC cong triangle DEF then CA = ________

If triangle ABC cong triangle DEF then AB = ________

Write the converse conradiction and contrapositive of the statement " triangle ABC cong triangle DEF , then1riangle ABC ~ triangle DEF".

In triangle ABC and triangle DEF , if angle A = angle F, angle B = angle D and AB = FD , then which one of the folloing congruence conditions applies :

If triangle ABC~triangle DEF such that the area of triangle ABC is 9 cm^2 and the area of triangle DEF is 16 cm^2 . If BC=2.1 cm, find the length of EF.