Answer:
If the area of the circle is 78.5 squared inches (note we use squared inches for areas and cubic inches for volume) and we want to know its radius [tex]r[/tex], we have to use the formula of the area of the circle:
[tex]A_{circle}=\pi r^{2}[/tex]
Then isolate [tex]r[/tex]:
[tex]r^{2}=\frac{A_{circle}}{\pi}[/tex]
Applying square root on both sides:
[tex]\sqrt{r^{2}}=\sqrt{\frac{A_{circle}}{\pi}}[/tex]
[tex]r=\sqrt{\frac{A_{circle}}{\pi}}[/tex]
Substituting the known values:
[tex]r=\sqrt{\frac{78.5 inch^{2}}{3.14}}[/tex]
[tex]r=5[/tex]>>>>>This is the radius
