Question 26
In regular tetrahedron ABCD, AB = AC = AD = BC = BD = CD. Points M and N are the midpoints of BC and AD respectively. If MN = 4 cm, what is the edge length of the tetrahedron?
Original printed choices: A) 4 cm; B) 4$\sqrt{1}$ c; C) 4$\sqrt{3}$ cm; D) 4/$\sqrt{1}$ cm; E) 5 cm
Editorial task: Resolve the printed question, explain any source inconsistency, and distinguish the literal result from a corrected or intended interpretation.
Original printed choices: A) 4 cm; B) 4$\sqrt{1}$ c; C) 4$\sqrt{3}$ cm; D) 4/$\sqrt{1}$ cm; E) 5 cm
Editorial task: Resolve the printed question, explain any source inconsistency, and distinguish the literal result from a corrected or intended interpretation.