Question

class 9
chap- quadrilateral
help pls​
a








also answer my previous question

Answer 1

Answer:

BD=DC because D is a centre of BC as E is a centre of AC.

Answer 2

Yes, BD and CD are equal

As it is given that BDEF & DCEF are parallelograms

Thus,
BD//EF
DC//EF
And we can see that EF is a common base of BDEF & CDFE

Thus by the theorem : parallelograms on the same base have equal area
BDEF =DCEF

Also opposite sides of parallelogram are equal

Thus
EF =BD
EF=CD
Sine things equal to same things are equal to each other
BD=DC

Hence Proved

(This can be also proved by [MPT] midpoint theorem)


Hope this will help you:)