You Do Need power plug adapter while traveling from Angola to Trinidad & Tobago.

Here is Why You Need An Adapter

The outlet and plug type used in Trinidad & Tobago are A and B and in Angola is C. This is how they look like.

Angola

In Angola, outlets of type C are in use.

Type C

Trinidad & Tobago

In Trinidad & Tobago, outlets of type A and B are in use.

Type A

Type B