Question

Is it possibly for anyone to help me answer this?

My teacher hasn't showed us yet but I want to have an idea on how to answer these questions.
*If possible are there any videos you would recommend me to watch in order to understand this more ​

Answer 1

from diagram...

radius, r = GO = 8

shaded region = (360deg -60deg)/360deg = 5/6

area of shaded region, a = 5/6 (pi × r^2)

=> a = 5/6 × pi x 8^2 = 160pi/3