Length per turn = \( \sqrt(\textcircumference)^2 + (\textpitch)^2 = \sqrt(2\pi \times 0.3)^2 + 0.2^2 = \sqrt(1.884)^2 + 0.04 \approx \sqrt3.549 + 0.04 = \sqrt3.589 \approx 1.895 \) m. - go-checkin.com