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A tapered wood cylinder is made by decreasing the radius of a wood rod continuously as you move from one end to the other. The speed at which it tapers is the taper per foot. You can calculate the taper per foot using the formula shown below. R is the radius at the large end, r is the radius at the small end, and L is the length of the wood rod all measured in inches. Find the length of the wood rod if R = 4in, r = 3in, and T = 0.75.