Find out the detailed solution process of this problem. Seventeen questions. High school math. Solid geometry problem - Training Enrollment Network

Find out the detailed solution process of this problem. Seventeen questions. High school math. Solid geometry problem

Connect alternating current. Take a little G on AC and make AF:FD=AG:GC connect FG EG, so it is easy to know FG//DC EG//AB.

And fg =1/3dc =1eg = 2/3ab = 2, so it is a right triangle in the triangle EFG.

So at 60 degrees.

The key to this problem is to transfer a straight line that is not on a plane to a plane and use the proportional point relationship!

I hope I can help you!

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