Consider the diagram. which line segment has the same measure as st? rx tx sr xs

go and ask your mom to you

answer: 4  

the square root of 16 is 4. it is a very simple mathematic concept. a square root when a number multiplied by itself will result in a number. here, the number 16 comes when 4 is multiplied by 4. hence the square root of 16 is 4. you can always figure out a square root by the inverse operation of squaring.  

answer is a.

13.268

hope you get it right.