You Do Need power plug adapter while traveling from Armenia to Bangladesh.

Here is Why You Need An Adapter

The outlet and plug type used in Bangladesh are A, C, D, G and K and in Armenia are C and F. This is how they look like.

Armenia

In Armenia, outlets of type C and F are in use.

Type C

Type F

Bangladesh

In Bangladesh, outlets of type A, C, D, G and K are in use.

Type A

Type C

Type D

Type G

Type K