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I really dont understand helpppp

I really dont understand helpppp-example-1

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Answer:

The sum of angles of a tiangle equals 180 degrees.

180-(92+51)=37 degrees (angle BEC)

180-(98+35)=47 degrees (angle DEC)

360-166-37-47=100 degrees (angle AED)

Explanation:

User Petrelharp
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