Question: Plane Pl1 is the plane containing the three points A 1 6 6 B 2 3 5 and C 2 3 5 Plane Pl2 is

 Plane Pl1 is the plane containing the three points A 1
6 6 B 2 3 5 and C 2 3 5 Plane

Plane Pl1 is the plane containing the three points A 1 6 6 B 2 3 5 and C 2 3 5 Plane Pl2 is the plane containing the three points D 1 1 2 E 4 3 4 and F 2 5 4 Find the smaller dihedral angle in degrees between the planes Pl1 and Pl2 O a 79 O b 26 O c 81 O d 53 28

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