Length of an arc between two angles: Difference between revisions

=={{header|Nim}}==

<lang Nim>import math, strformat

func arcLength(r, a, b: float): float =

## Return the length of the major arc in a circle of radius "r"

## between angles "a" and "b" expressed in radians.

let d = abs(a - b)

result = r * (if d >= PI: d else: 2 * PI - d)

echo &"Arc length: {arcLength(10, degToRad(10.0), degToRad(120.0)):.5f}"</lang>

{{out}}

<pre>Arc length: 43.63323</pre>