AQA Mechanics (M1), Statics and forces, please hel

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A particle of weight W is attached by a light inextensible string of length a to a point A on a verticle wall. The particle is supported in equilbrium by a light rigid strut of length b attached to a point B on the wall at a distance a vertically below A. Show that the tension in the string is W and find the thrust in the rod.

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