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\(ABCD\) is a regular tetrahedron (right pyramid whose faces are all equilateral triangles). If \(M\) is the midpoint of line segment \(CD\), then what is \(cos\angle{ABM}\)?

 

Please help me, thanks. smiley

 Jan 29, 2022
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ABCD  is a regular tetrahedron (right pyramid whose faces are all equilateral triangles).

If M  is the midpoint of line segment CD , then what is cos

 

 

See if you can make sense of my pic and then use cosine rule.

 

 Jan 30, 2022

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