Answer:
Your answer is 9x^6*y^2π
Explanation:
The formula for a circle is πr^2, with r as the radius.
Since 3x^3*y is the radius, you put that value in to get the equation:
(3x^3*y)^2*π
Once simplified, you get 9x^6*y^2π.
You can simplify further using the value of π, but it depends if the questions wants you to or not, mostly it doesn't.
I hope this was helpful.