The base of a triangular prism ABC.A'B'C' is an equilateral triangle with lengths a, and the lengths of its adjacent sides also equal a. Let I be the midpoint of AB and $B'I \perp (ABC)$. Find the distance from the B' to the plane (ACC'A') in term of a
The base of a triangular prism ABC.A'B'C' is an equilateral triangle with lengths a,
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geometry