Question: 41 Let a and b be two perpendicular planes, having the straight line r as their intersection. From a point P belonging to plane b,
41 Let a and b be two perpendicular planes, having the straight line r as their intersection. From a point P belonging to plane b, but not to line r, draw the line s perpendicular to r. Prove that s is perpendicular to plane a. Please solve with euclidean geometry, thanks
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