Answer:
7 km
Step-by-step explanation:
Substitute:
The equation for area of a semi-circle is [tex]\frac{r^{2}\pi }{2}[/tex]
A = [tex]\frac{r^{2}\pi }{2}[/tex]
76.97 = [tex]\frac{r^{2}\pi }{2}[/tex]
Multiply by 2 on both sides:
2(76.97) = ( [tex]\frac{r^{2}\pi }{2}[/tex])2
153.94 = [tex]r^{2} \pi[/tex]
Divide by pi on both sides:
153.94 = [tex]r^{2} \pi[/tex]
/pi /pi
49.03 ≈ [tex]r^{2}[/tex]
Find the square root:
[tex]\sqrt{49.03} =\sqrt{r^{2} }[/tex]
7 = r
