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It was not in an episode. The anime did not get that far. The anime ended with big differences from the manga at the end of the Faudo arc.
NARUTO:
Zabuza Arc
Chunin Exam Arc
Leaf Destruction Arc
Tsunade Search Arc
Chasing Sasuke Arc
NARUTO SHIPPUDEN:
Saving Gaara Arc
Sasuke Reunion Arc
Immortal Duo Arc
Sasuke vs Itachi Arc
Pain Arc
War Arc
an arc is a segment of a circle. If the arc subtends a full angle of 360 degrees, then the arc is a circle; but this is a special case of an arc.
The arc length is the radius times the arc degree in radians
area of an arc =lenght of arc *radius/2