You Do Need power plug adapter while traveling from Angola to Laos.

Here is Why You Need An Adapter

The outlet and plug type used in Laos are A, B, C, E and F and in Angola is C. This is how they look like.

Angola

In Angola, outlets of type C are in use.

Type C

Laos

In Laos, outlets of type A, B, C, E and F are in use.

Type A

Type B

Type C

Type E

Type F