You Do Need power plug adapter while traveling from Angola 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 Angola is C. This is how they look like.

Angola

In Angola, outlets of type C are in use.

Type C

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