如图,AB‖ED,用多种方法说明∠ABC+∠BCD+∠CDE=360

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如图,AB‖ED,用多种方法说明∠ABC+∠BCD+∠CDE=360
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如图,AB‖ED,用多种方法说明∠ABC+∠BCD+∠CDE=360
如图,AB‖ED,用多种方法说明∠ABC+∠BCD+∠CDE=360

如图,AB‖ED,用多种方法说明∠ABC+∠BCD+∠CDE=360
1.过c点做ED∥CF
此时∠ABC=∠BCF,∠EDC=∠DCF,故∠ABC+∠BCD+∠CDE=360°

或2.连接DB,∠1+∠2+∠3+∠4+∠5=180+180=360
故∠ABC+∠BCD+∠CDE=360°