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In geometry, the square tiling, square tessellation or square grid is a regular tiling of the Euclidean plane.It has Schläfli symbol of {4,4}, meaning it has 4 squares around every vertex.
The number π (/ p aɪ / ⓘ; spelled out as "pi") is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its diameter.It appears in many formulae across mathematics and physics, and some of these formulae are commonly used for defining π, to avoid relying on the definition of the length of a curve.