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- Find the arc length L of the graph of r(t). r(t)= 4 cos(t)i + 4 sin(t)j + tk, 0 ≤ t ≤ 2πGiven R(t) = (1 – 4 cos t) î + 3 cos ĵ + 5 sin t k̂, find the arc length of the portion of R(t) from t = 0 to t = π; moving trihedral of the curve R(t) at t =π/3Find the arc length from (x1, y1) to (x2, y2) on the graph of f(x) = mx + b.