Question

如图,AB‖EF,AB‖CD,若∠EFB=120°,∠C=70°,求∠FBC 的度数

Answer 1

是不是这个图?∵,AB‖EF∴∠ABF+∠EFB=180°∴∠ABF=180°-∠EFB=180°-120°=60°∵AB‖CD∴∠ABC=∠C =70°∴∠FBC =∠ABC-∠ABF=70°-60°=10°