Question: What is the length of the arc of a circle with a radius of 4 units and a central angle of 90 degrees?

Options:

1. 2π units
2. 4π units
3. π units
4. 8 units

Correct Answer: 2π units

Solution:

Arc length = (θ/360) * 2πr = (90/360) * 2π(4) = (1/4) * 8π = 2π units.