Geometrymedium · Past Paper
The angle between the pair of lines represented by x^2 - y^2 = 0 is:
A30 degrees
B45 degrees
C60 degrees
D90 degrees
✓ Correct Answer: D — 90 degrees
x^2 - y^2 = 0 factors to (x-y)(x+y)=0. Slopes are 1 and -1. Product = -1, so they are perpendicular (90 degrees).
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