.

Well it is a little late to tell you this not.....but nobody re-torques they cylinder head cap bolts.  They are small and easy to break....you are lucky you didn't pull any threads out of the soft aluminum cylinder.

The 45 degree angle one is the retaining bolt for the decompression shaft.

About your only option now is to pull the head cover, and see if you can get the broken bits out without removing the head.  Often when the bolt break the pressure is gone....and the threaded portion can be backed out easily.  Sometimes a bit of epoxy on a wooden dowel is enough if you only put enough epoxy to glue the wooden dowel to the broken bolt without getting any epoxy oozed to the outside of the hole - but it is going to have to get to 60-70 degrees before you can epoxy anything.  The next option is a small drill and screw/bolt extractor.  A left hand drill may be enough.

Get a tube that barely slides in the hole,then get a rod that just slides in it and sharpen it, spank it, then drill. Left hand is the best answer. Rod used for punch and drill, same size. Use the tube to keep the drill straight and centered. If the drill doesn't get it then hunt a left hand tap.

If you try glue and get it in the threads you're,in a word, screwed.