因为1/2角ABC+1/2角BAC+1/2角BCA=90又因为1/2角BCA+角GHC=90所以角GHC=1/2角ABC+1/2角BAC因为角AHB=180减1/2角BAC减1/2ABC又因为角AHB=180减角AHE所以1/2角BAC+1/2角ABC=角AHE所以角AHE=角CHG
