Can't see the image
[IMG]i.imgur.com/oMb06fH.png[/IMG]
I am trying to find the area but couldn't the radius be 6 or 9? Isn't there too little information? I know how to do the rest; I just need someone to tell me that what I'm saying makes sense.
Here's the link:
i.imgur.com/oMb06fH.png
You are right about there being two radii (but that's not what they're called, in this case they'd be called the semi-minor axis and the semi-major axis). The shape is actually half an ellipse. To find the area of an ellipse, use $\displaystyle \begin{align*} \pi\,a\,b \end{align*}$, where a and b are the semi minor and semi major axes.