Question 353565
Hi,
*Note: it is the length diagonally of the square peg used to test a hole that measures the diameter of the hole.

.
Let x be the length of each side of square plugs.
x^2 + x^2 = 3.16cm^2
.
2x^2 = 3.16cm^2 = 9.986 cm^2
x^2 = 4.993
x = 2.23cm