16,250 Sq Feet i pretty sure its that one
Area of sector CAD = 72 / 360 x pi x 6^2 = 7.2pi = 22.6195 in^2
Therefore, area of segment CED = 22.6195 - 17.18 = 5.44 in^2
Magnitude - 1. The great size or extent of something; great importance. 2. Size. 3. The degree of brightness of a star.
- via Google
It more than likely means size.