Image a right triangle with two points at these two locations and the hypothenuse as the distance between them. Find the length straight down from the first point to the second: 10 units Find the length to the right from the first point to the second: 10 units Use the Pythagorean theorem: a^2 + b^2 = c^2 10^2 + 10^2 = 200 √200 = 10√2 = 14.14 units
