The diagram below shows a model of a staircase in which all the riser heights are equal and all the tread lengths are equal Tread Riser Stair Angle A carpenter wants to build a staircase in which each riser has a height of 6 inches and each tread has a length of 11 inches. Which of the following expressions is equal to the stair angle? (4). sin sin tan (D) tan

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