13. Coordinate Geometry
iGCSE (2021 Edition)
13.18 Perpendicular lines (Extended)
Interactive practice questions
Select the single best definition that describes two perpendicular lines.
Two lines that intersect each other at an angle of 90°.
A
Two lines that have only one intersection.
B
Two lines whose product of gradients is equal to $1$1.
C
Two lines that have no intersections.
D
Easy
< 1min
If two lines are perpendicular, what is the product of their gradients?
Easy
< 1min
Are the lines $y=x+1$y=x+1 and $y=x-1$y=x−1 perpendicular?
Easy
< 1min
Are the lines $y=3x-7$y=3x−7 and $y=-3x+6$y=−3x+6 perpendicular?
Easy
< 1min
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