please help me answer this i really need help !!

Answer:
A= 314.16m^{2}
Step-by-step explanation:
if its a half a circle then we use the formula to find area of a circle and get half of it.
[tex]A=\pi r^{2}[/tex]
[tex]A=\pi 10^{2}[/tex]
[tex]A= 314.16m^{2}[/tex]