# What is the square root of 145?

##### 1 Answer

Oct 18, 2015

#### Explanation:

You can find approximations for

My current favourite is using something called continued fractions.

#145 = 144+1 = 12^2 + 1# is of the form#n^2 + 1#

#sqrt(n^2 + 1) = [n;bar(2n)] = n + 1/(2n+1/(2n+1/(2n+1/(2n+...))))#

So

#sqrt(145) = [12;bar(24)] = 12 + 1/(24+1/(24+1/(24+...)))#

We can get an approximation by just truncating the repeating continued fraction.

For example:

#sqrt(145) ~~ [12;24] = 12 + 1/24 = 12.041dot(6)#