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Mathematics 7 Online
OpenStudy (ellamoyseyuk):

In the figure below, what is the value of x?http://cdn.activelms.com/data/042c73b1-ddf5-4fd6-91e7-6c8434228f3d/Geometry%20Images/unit%2012-4%20q3.png

OpenStudy (luffingsails):

I believe that the answer is 90 degrees but I am thinking about how to prove that's true.

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