∵AB和CD都是直线,EO⊥AB,∠3 =∠FOD
∴∠AOC =∠BOD∠AOC +∠2 = 90°,∠3 +∠的FOD +∠BOD = 180°
∵∠AOC =∠2 = 27°20'
∴∠2 = 62°40',∠3 =(180°-27°20')/ 2 = 76°20'
∵AB和CD都是直线,EO⊥AB,∠3 =∠FOD
∴∠AOC =∠BOD∠AOC +∠2 = 90°,∠3 +∠的FOD +∠BOD = 180°
∵∠AOC =∠2 = 27°20'
∴∠2 = 62°40',∠3 =(180°-27°20')/ 2 = 76°20'