Circular sector, radius 1.875 cm, central angle 165.58°.

The length of the **arc** is given by *s* =
*r**θ*.

First we must convert `165.58°` into radians:

`165.58° = 165.58 × π/180 = 2.8899` radians.

So arc length is: `s = 1.875 × 2.8899 = 5.419` cm.

So the perimeter of the cam is:

`2 × 1.875 + 5.419 = 9.169` cm.

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