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Find the angle betweeen a plane and a line segment

Here is the question of the video: EFGH-ABCD is a cube. GE is a diagonal in plane EFGH. Connect ED and FC. What is the degree measure of the angle between the plane EFCD and the line segment GE?

If you are interested in the detail solution of this problem, please click the detail solution on how to find the angle between a line segment and a plane.