OMM 1987 Problem 8
(a) Tres rectas en el espacio , , concurren en el punto y un plano perpendicular a corta a , y en , y , respectivamente. Suponga que los ángulos y son de y que el ángulo es recto. Calcule el ángulo .
(b) Si un plano perpendicular a corta a , y en , y , respectivamente y si , calcule los lados del triángulo .
Official text Mexican Mathematical Olympiad 1987 official paper, page 1. Quoted with source.
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