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An involute profile is used in

An involute profile is used in Correct Answer gears

The tooth profiles of a pair of mating gears must be made of curves that satisfy the conditions of conjugate action and law of gearing. Gears are generally made with two curves either involute or cycloidal tooth profiles.

A cycloid is a curve traced by a point on the circumference of a circle which rolls without slipping on a fixed straight line.

An involute of a circle is a plane curve generated by a point on a tangent, which rolls on the circle without slipping or by a point on a taut string which in unwrapped from a reel.

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