Answer:
9
Explanation:
There is a simple formula that can be applied here, appropriately termed the distance formula. It is d = sqrt( (x2 - x1)^2 + (y2 - y1)^2 ), where (x1,y1) and (x2,y2) are the two given points. It doesn't matter which point is which, it ends up being the same since both binomials are being squared. The formula is simply an application of the Pythagorean theorem. In coordinate space, you're constructing a right triangle using the line connecting the two points as the hypotenuse, with horizontal and vertical lines as the legs. Then it's simply c^2 = a^2 + b^2, and you can get the distance formula by square rooting both sides.