In the adjoining figure, D, E and F are mid points of BC, CA and AB respectively. Then,
BDEF is a parallelogram
CDFE is a parallelogram
BCEF is a trapezium
All of the above
The line segment joining the mid-points of two sides of a triangle is parallel to the third side.
So, FE || BC also FE || BD
and, DE || AB also DE || AB
and FD || AC also FD || EC
So, BDEF is a parallelogram.
and CDFE is parallelogram
BCEF is a trapezium
as BC || EF