How do I do this?

Question

Finf the radius of each circle with the given measurement....
A=289(pi)in squared

**Please show work and explain if possible! I have more problems like this one, and I don't want to have to refer to this website for more than one.**
Thank you in advance!

Answer 1

If you meant Area = 289.pi in^2 (square inches), then the procedure to get radius is as follows.

Area = pi.r^2 where r is the radius of the circle.

So, pi.r^2 = 289.pi

Or r^2 = 289

r = sqrt. 289 = 17

So, the radius is 17 inches.

Answer 2

The area of a circle = pi * radius squared. So you already know the area (I assume that's what A is).

289*pi = pi*r^2

The pi cancels out on each side, so 289 = r^2

So r is the square root of 289. Technically that would be plus OR minus 17, but since a circle can't have a negative radius, the radius of the circle must be 17 inches :)

Answer 3

r = 17.

That's because the area of a circle is pi r^2, so r^2 = 289.

Therefore, by the well-known 17 times table (known to every Vulcan kindergartner), the answer must be 17, as 17 x 17 = 289.

Live long and prosper.

Answer 4

A=(pi)*radius^2
(pi)r^2=289(pi)
divide by (pi)
r^2=289
Square root 289= r
so r=17