MHB What Is $\angle ADB$ in a Plane with Given Side Lengths?

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In a plane we have :$\overline {AB}=\overline {BC}=\overline {CA}=\overline {CD}=10$ and $\overline {AD}=11$

find :$\angle ADB=?$
 
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johng said:
Simple solution:
very nice!
 

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