how to find answers of square roots by using log book if solving a question of corelation?

Dear Student

Log books or charts are used to find out logarithm value of a number . Not square roots. But if you want to search for square roots , suppose you need square of 10 . 

Let 10² = a 
Therefore ${\log }_{10}a$ = 2 
Now a log book can be used to find out value of a . 

Regards .