2022 AMC 12A Problems/Problem 12
Problem
Let be the midpoint of
in regular tetrahedron
. What is
?
Solution
Let the side length of be
. Then,
. By the Law of Cosines,
Let be the midpoint of
in regular tetrahedron
. What is
?
Let the side length of be
. Then,
. By the Law of Cosines,
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