Question

What is the area of the circle if XY=5.4 mm?

Answer 1

Could you explain some more? What's XY?

Answer 2

You've given the equation for a hyperbola.

An equation for a circle looks like:
\[x^2 + y^2 = r^2\]

where r is the radius of the circle

Answer 3

That can't be right. The given equation has XY, not X+Y. So, multiplication would be done.

Answer 4

xy=5.4 is not a circle, though
http://www.wolframalpha.com/input/?i=xy%3D5.4

Answer 5

But, are X and Y referring to coordinates or variables?

Answer 6

I dunno, I can't imagine what the question might be. Have to wait for OP to respond