diff --git a/maths/arc_length.py b/maths/arc_length.py
new file mode 100644
index 000000000..9e87ca38c
--- /dev/null
+++ b/maths/arc_length.py
@@ -0,0 +1,15 @@
+from math import pi
+
+
+def arc_length(angle: int, radius: int) -> float:
+    """
+    >>> arc_length(45, 5)
+    3.9269908169872414
+    >>> arc_length(120, 15)
+    31.415926535897928
+    """
+    return 2 * pi * radius * (angle / 360)
+
+
+if __name__ == "__main__":
+    print(arc_length(90, 10))