Triangle ABC has the following vertices: A(-4,6)
B(6,6)
C(1, -3)
Is triangle ABC an equilateral triangle, and why?

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.