Mathematics for IGCSE & O level - Coordinate Geometry (Section 1 - No. 26)
A line has a gradient of 2/3. What is the gradient of a line perpendicular to it?
-3/2
3/2
-2/3
2/3
ব্যাখ্যা
The gradient of a perpendicular line is the negative reciprocal: -3/2.