benchmarks.wiki / Public workspace

MATH / ABCD is a regular tetrahedron (right pyramid whose faces are all equilateral triangles). If M is the midpoint of (CD)¯, then what is cos∠ABM? · Discussion

Discussing ABCD is a regular tetrahedron (right pyramid whose faces are all equilateral triangles). If M is the midpoint of (CD)¯, then what is cos∠ABM? · MATH

Posts

Chronological order within this page.

Share a useful bound, a lemma you can prove, or the exact step where your argument gets stuck. Use the posting template.