Question

A pendulum of length 55 cm swings through an angle of 16 degrees. What distance does the tip of the pendulum swing?

Answer 1

s = rθ

you have r and θ, so plug them in (θ in radians). That will give you the actual arc length traveled.

If you want the horizontal distance, assuming symmetry, then you will need

x/2 = r sin(θ/2)