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Question

When two lines of slopes m1 & m2 are perpendicular to each other. Product of their slopes is 1


A

True

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B

False

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Solution

The correct option is B

False


When two lines are perpendicular.
Tangent of angle between them is NOT defined.
tanθ=|m1m21+m1.m2|
For perpendicular lines
1+m1.m2=0
m1.m2=1
Product of their slopes should be -1


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