Question

Please explain this to me i do not understand I need help

Answer 1

Answer:

Central angle = 90°

Step-by-step explanation:Given length of arc = 4π

Radius= 8

Central angle=?

We know that,

Length of arc = (angle/360°) * 2π*r

4π=(angle/360°) * 2π* 8

(angle/360°)= (4π)/(16π)

(angle/360°) = (1/4)

angle= (360/4)

Angle= 90°

Answer 2

$lenght \: of \: arc \: = \frac{ \alpha }{360} 2\pi r \\ = > 4\pi = \frac{ \alpha }{360} 16\pi \\ = > \alpha = 90$

option c . 90 is crct answer

hope it helps you