Question 1198241
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The solution to this problem in the post by @onynlee is incorrect.


First error is in n.3, where they say


        "We know that the lateral edge, base edge, and height form a right triangle".


This statement is incorrect, and all associated with it calculations in n.3 
are incorrect.   These three elements do not form any triangle.


They pull along with them incorrect calculations in the rest of the post.