The formula of an area of a circle:
[tex]A=\pi r^2[/tex]
r - a radius
We have r = 14m. Substitute:
[tex]A=\pi\cdot14^2=196\pi\ m^2[/tex]
If you want an approximate area, you can accept [tex]\pi\approx3.14[/tex]
Then:
[tex]A\approx196\cdot3.14=615.44\ m^2[/tex]
