Mathematics for IGCSE & O level - Coordinate Geometry (Section 3 - No. 44)
If the gradient of a line is 2, what is the gradient of a line perpendicular to it?
-1/2
2
1/2
-2
ব্যাখ্যা
The gradient of a line perpendicular to a line with gradient m is -1/m. So -1/2