Question

The radius of a circle is 5 kilometers. What is the length of a 90° degree arc?

Answer 1

s =5*π/2 km

Explanation:

arc length s = rθ

where θ =central angle in radians

r = 5km

θ = 90 degrees = 90 degrees/360degrees * 2π =
`(1)/(4)`(2π) = π/2

s =5*π/2 km