Question

如图,AB∥ED,∠B+∠C+∠D=

1. A.
   180°­
2. B.
   360°­
3. C.
   540°­
4. D.
   270°

Answer 1

B
过点C作直线MN∥AB，则MN∥ED．
∴∠MCB+∠B=180°，∠MCD+∠D=180°．
∴∠B+∠BCD+∠D=∠MCB+∠MCD+∠B+∠D=180°+180°=360°．
故选B．