arc length along x-axis

Move the green point to form a central angle of 1 radian. Given that the radius = 4 ft, what is the length of segment p in feet?
Move the green point to form a central angle of 2 radians. What is the length of segment p?
Move the green point to form a central angle [math]\pi[/math] radians. What is the length of segment p?
Move the green point to form a central angle 5 radians. What is the length of segment p?
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Information: arc length along x-axis