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Perpendicular edge of tetrahedron (Posted on 2021-02-02) Difficulty: 3 of 5
Let ABCD be a tetrahedron with ∠BAD = 60, ∠BAC = 40, ∠ABD = 80, ∠ABC = 70. Prove that the lines AB and CD are perpendicular.

No Solution Yet Submitted by Danish Ahmed Khan    
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  Subject Author Date
No SubjectSumit Mishra2021-02-04 12:33:22
No SubjectHempstrol2021-02-03 20:27:17
SolutionSolutionJer2021-02-03 08:45:20
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