Question: What is the length of the arc of a circle with a radius of 5 cm and a central angle of 90°?

Options:

1. 3.93 cm
2. 7.85 cm
3. 12.57 cm
4. 15.71 cm

Correct Answer: 7.85 cm

Solution:

Arc length = (θ/360) * 2πr = (90/360) * 2π * 5 = (1/4) * 10π ≈ 7.85 cm.