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?

1 radian 4 ft No Idea! 1 ft

Move the green point to form a central angle of 2 radians. What is the length of segment p?

8 ft 4 ft 2 radians 1 radian

Move the green point to form a central angle [math]\pi[/math] radians. What is the length of segment p?

1 ft [math]4\pi[/math] ft [math]\pi[/math] ft

Move the green point to form a central angle 5 radians. What is the length of segment p?

cannot tell from info give. [math]5\pi[/math] ft 5 ft 20 ft

Information: arc length along x-axis