Question

Math homework help wanted

Answer 1

C.
`2\pi`

Explanation:

Central angle
`( \theta) = (\pi)/(2) = 90\degree`

Radius (r) = 4

`l(\widehat{EF}) = ( \theta)/(360 \degree) * 2\pi \: r \\ \\ = (90 \degree)/(360 \degree) * 2\pi(4) \\ \\ = (1)/(4) * 2\pi(4) \\ \\ l(\widehat{EF}) = 2\pi`