The ladder 12 ft long is supported by a horizontal floor and a vertical wall, weighs 30 lb and supports a person weighing 175 lb at point D. The vertical wall is smooth. The coefficient of friction at A is 0.30. Calculate the minimum angle at which the ladder will stand without slipping to the left. 6'-0" 3-0" P = 175 lb B 3'-0" A D W-30 lb A/