पाटीगणित (श्रीधराचार्य - प्राचीन संस्कृत टीका एवं प्रो. कृपाशंकर शुक्ल सविस्तार व्याख्या)

92 DETERMINATIONS
It is evident that the larger the square number is chosen, the better
will be the approximation. Hence the above rule.
In the Bakhshālī Manuscript the following formula is used for finding
an approximate value of the square root of a non-square number :
√(a² + b) = a + b/(2a) − ((b/(2a))²) / (2(a + b/(2a))) appr