### Related : Curve Tracing

The process of **rectification** involves **c****omputation of lengths of curves**. The logic behind this is based on right triangle geometry and calculus.

Consider a curve in plane. Let the curve be divided into infinitesimally smaller parts. Let be the length of a part. As we take the limit, the arc length approximates to a straight line and we have,

On integrating,

This gives the length of curve between the lines and .

For parametric curves ,

For polar curves ,

For polar curves ,

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