I could have made an error - or even misread the question...let's go through this again.....
m arc AEB =
360 - m arc AB =
360 - 84 =
276
Now that I look at it, I think I did goof on this one before.......please accept my apologies....I try to do a good job on here, but every now and then, I b**w a fuse.........!!!!