Question: 42 Let b and g be two planes, both perpendicular to the plane a, having the straight line r as their intersection. Prove that the

42 Let b and g be two planes, both perpendicular to the plane a, having the straight line r as their intersection. Prove that the line r is perpendicular to the plane a.

(please give a solution based on euclidean geomtry NOT USE VECTOR , NOT USE LINEAR ALGEBRA) Thanks

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