Question

test pitch of a screw gauge is 1mm and surplus scale as 200 div while measuring diameter of a wire the main scale reads 2 mm and 45th mark on circular scale coincides with the base line. find the lease count and diameter of the wire​

Answer 1

of a diagonal across a square with sides of one unit of length; this follows the Pythagorean theorem. It was probably the first number known to be irrational.[citation needed]

As a good rational approximation for the square root of two, with a reasonably small denominator, the fraction 99/70 (≈ 1.4142857) is sometimes used.

The sequence A002193 in the OEIS consists of the digits in the decimal expansion of the square root of 2, here truncated to 65 decimal places: