Area of a Circle = pi x r^2
---Where r is the radius of the circle
r = 16
A = pi x 16^2
A = pi x 256
A = 256pi = 804.2477 cm^2
Simplified/Exact Form = 256 pi
Rounded to the nearest tenth = 804.2
Rounded to the nearest hundredth = 804.25
Rounded to the nearest thousandth = 804.248
Rounded to the nearest ten thousandth = 804.2477
Hope this helps!