Question: What is the length of an arc of a circle with a radius of 3 cm that subtends an angle of 90 degrees at the center?

Options:

1. π cm
2. 1.5π cm
3. 3π cm
4. 6 cm

Correct Answer: 1.5π cm

Solution:

Arc length = (θ/360) * 2πr = (90/360) * 2π(3) = (1/4) * 6π = 1.5π cm.