No Angela knew that Pam knew. In the episode where Dwight got the concussion Pam came around to tell Oscar about Dwight being okay (but really she meant it for Angela and she caught onto that).Originally Posted by babymay;2591121;
Also in one of the episodes of season 3 where Dwight quit (I think it was the Return) Angela went to Pam and said something like "I really miss him." Pam said "Dwight?" and Angela said "No John Denver." or something like that. Then she went on to talk to Pam about Dwight. So yeah she knew that Pam knew.