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An interactive two dimensional plot with an oriented curve from a point
\(P\) to a point
\(Q\text{.}\) The curve moves up and left from the point
\(P\text{,}\) then turns up and to the right before moving down and right to the point
\(Q\text{.}\) The slider above the plot changes the number of line segments drawn between intermediate points on the oriented curve. Line segments are drawn in blue between intermediate points on the curve. The length of the blue line segments is displayed as an approximation to the true arc length of the oriented curve.