Abcd is a rhombus. find ab. enter your answer as a fraction in simplest form.

answer: i think it is c

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.