Mathematics for IGCSE & O level - Coordinate Geometry (Section 4 - No. 26)
Which of the following represents the length of a line segment with endpoints (x1, y1) and (x2, y2)?
sqrt((x2 - x1)^2 + (y2 - y1)^2)
(y2 - y1)/(x2 - x1)
sqrt((x1 - x2)^2 + (y1 - y2)^2)
((x1+x2)/2, (y1+y2)/2)
설명
The length is calculated using the distance formula derived from Pythagoras, or sqrt((x2 - x1)^2 + (y2 - y1)^2)