Arc length of a polar curve in terms of theta

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Is there an equation for such? I know that there is an equation for such in terms of r, but I must calculate the length of $tan(\theta) = 3/5$ (cartesian equivalent: $y = 3/5x$) from r = 0 to 1.457.

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Hint: This curve is a line. Draw it, and label both endpoints. How long is it? (No calculus is required).