Respuesta :

Answer:

pi

Step-by-step explanation:

Theta is 1/2 of a circle

A circle is 360 degrees or 2pi radians

Take 1/2 of that for a semi circle

180 degrees or pi radians

Answer:

pi

Step-by-step explanation:

Arc length = r × theta

8pi = 8 × theta

theta = 8pi/8

= pi radians