Question

What is the area of a sector with a central angle of 210 degrees and a diameter of 4.6m?

Answer 1

Sector area = (central angle / 360) * PI * radius^2
sector area = (210 / 360) * PI * 2.3^2
sector area = (7 / 12) * PI * 5.29
sector area = 9.6944313302
sector area = 9.7 square meters (rounded)

Source:
http://www.1728.org/radians.htm