Question

如图,ED‖BC‖FG,求∠A+∠B+∠C+∠D+∠E+∠F+∠G的度数.可以做辅助线最好.

Answer 1

∠E+∠F=180

∠C+∠D=180

∠G=∠AHB

∠A+∠B+∠G=180

∠A+∠B+∠C+∠D+∠E+∠F+∠G=540