Question

What is the radius of a circle with an area of 78.5 cubic inches? Use 3.14 for pi. Enter your answer in the box.

Answer 1

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 $r$, we have to use the formula of the area of the circle:

$A_{circle}=\pi r^{2}$  

Then isolate $r$:

$r^{2}=\frac{A_{circle}}{\pi}$  

Applying square root on both sides:

$\sqrt{r^{2}}=\sqrt{\frac{A_{circle}}{\pi}}$  

$r=\sqrt{\frac{A_{circle}}{\pi}}$  

Substituting the known values:

$r=\sqrt{\frac{78.5 inch^{2}}{3.14}}$  

$r=5$>>>>>This is the radius

Answer 2

Answer:

its basicaly just 5 :)

Step-by-step explanation: i took the test