# SECTION D e and Prove Midpoint theorem of triangle. te and Prove Central Angle Theorem of Circle.

E and F are mid-points of AB and AC respectively.

Also, CD parallel to BA.

Tr.AEF congruent to Tr.CDF (ASA Rule.)

So,

EF=DF AND BE=AE=DC

Therefore, BCDE is a parallelogram.

Thus gives EF is parallel to BC.

Also,

EF=1/2ED=1/2BC.