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Update arc_length.py with diameter usage instead of radius #11703

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Update arc_length.py with diameter usage instead of radius #11703

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4 changes: 2 additions & 2 deletions maths/arc_length.py
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Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
from math import pi


def arc_length(angle: int, radius: int) -> float:
def arc_length(angle: int, diameter: int) -> float:
"""
>>> arc_length(45, 5)
3.9269908169872414
Expand All @@ -10,7 +10,7 @@ def arc_length(angle: int, radius: int) -> float:
>>> arc_length(90, 10)
15.707963267948966
"""
return 2 * pi * radius * (angle / 360)
return pi * diameter * (angle / 360)


if __name__ == "__main__":
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