ok so i have worked out this problem and i am getting a crazy number

here is the question:

find surface area of paraboloid z = x^2 + y^2 cut off by plane z = 9?

my solution is (74$\displaystyle \pi $*sqrt(37) / 12 )- ($\displaystyle \pi $/6)

can someone check my ans please it would help me so much

sorry if hard to read having trouble with it