Question

What is the length of arc S?
(The angle in the figure is a central angle in radians)

Answer 1

π/90 or 0.0035 units

Explanation:

equation: length of the arc = ∠of the angle/360 * circumference

Substitute: S = 0.4/360 * 10π --> C = 2πr

Simplify: S = 1/900 * 10π

Simplify: S = π/90 ≈ 0.003489 units