I suspect you are referring to the laver in 2 Chronicles 4:2
In describing the measurements of this laver, the circumference is given as 30 cubits (or 540 inches if the cubit was 18 inches) while the diameter is 10 cubits. However, circumference is arrived at by multiplying the diameter by pi (3.14159), and that total is more than 565 inches, an apparent, but not real contradiction.
The 10-cubit measurement was from brim to brim; that is, from one outside edge to the other. But verse 5 states that the width of the edge was a handbreadth, or about 4 inches. So the inside diameter was 10 cubits (180 inches) minus two handbreadths (8 inches). Multiplying 172 inches by pi, the total is 540 inches, the same circumference as given in verse 2.
The granddaughters watched Life of PI last night in 3D in the living room.