Final answer:
The formula used to calculate the distance between two coordinates in a plane is the Distance formula, which is derived from the Pythagorean theorem.
Step-by-step explanation:
The formula used to calculate the distance between two coordinates in a plane is the Distance formula. It is derived from the Pythagorean theorem and is given by d = √((x2 - x1)² + (y2 - y1)²), where (x1, y1) and (x2, y2) are the coordinates of the two points.