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Connecting DE

1. It is proved that △ABD is Rt△, then ∵CE is the center line of AB.

∴E is the midpoint of AB

∴ED= 1/2AB=BE=AE

∵DC=BE

∴DC=DE

∫DE = DC in △ dec.

And ∵DG⊥EC

∴EG=GC

G is the midpoint of the Chief Executive.

2. First, it is proved that △ bed and △ EDC are isosceles △. Then ∴∠B=∠BDE.

∠DEC=∠ECD

∠∠BDE =∠DCE+∠DEC

∴∠BDE=2∠DCE=∠B

Agree with 96| Comments (7)

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There are also three answers: 2010-10-719: 57 Lan Xin Yu Meng | Level 1, Step 1, Link DE.

The next step is to apply some theorems.

In △ABD, because E is the midpoint, DE=AE=BE (right triangle theorem) is obtained.

In △CDE, G is the midpoint (isosceles triangle theorem) according to the equal relationship between sides CD=BE=DE and DG⊥CE.

In △BED, BE=DE, so ∠B=∠EDB=2∠BCE.

OK \ (o)/~

The thinking must be clear, and the answers can be sorted out by yourself. This is my little experience. I wish the landlord the more he learns, the more handy he will be. Agree 6| Comment 2010-10-901:44 zkfndsq | Mr. Wang, a first-class citizen of Nanchang.

Reporter Chen Yanwei and intern Zhou Yanhua reported that the salary card suddenly increased by 300,000 yuan. What should I do? Yesterday, the groom announced a donation of 200,000 to help the disabled. Mr. Wang, a citizen of the provincial capital, encountered such a "good thing." After that, he took the initiative to find the bank. Under the witness of the public security police, 300,000 yuan was "returned to the original owner", and the 80-year-old woman fell from the 12 floor, killing 70-year-old passers-by.

165438+ At 0 o'clock yesterday morning, Mr. Wang went to Nanchang Hubin Sub-branch of Agricultural Bank of China, which is located on Nanjing East Road, the provincial capital, and used his bank card to check whether his salary had been paid to the ATM. Upon inquiry, Mr. Wang found that his salary card was 300,000 yuan more.

According to Wang Zhigang, he works in a trading company. "My first reaction at that time was that this 300,000 can't be wanted, and the money must be returned through the bank. If it wasn't my money, I wouldn't take it. This is the basic principle of being a man. "

Mr. Wang said mute