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In the plane truss of statically indeterminate structure, there are only tension bars and compression bars. Node 4 is hinged. Moreover, only 13, 43 horizontal bars keep the force balance in the horizontal direction (the characteristic of statically indeterminate structure). So it is not stressed in the vertical direction. Therefore, the force on 45 bar is zero. According to the given height and span, the diagonal angle can be calculated. The vertical pressure of 40KN is equally divided on both sides. You can work out the result.