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

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Albert1

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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johng1

Last edited by a moderator: Dec 9, 2015

Albert1

johng said:

Simple solution:

very nice!

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