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Question

A, B and C are the points on a coordinate plane. The ΔABC is a right-angled triangle (right-angled at C ). If AC is parallel to the X-axis and the angle between AB and AC is 45o. The slope of AB is___ .


A

0

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B

1

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C

2

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D

not defined

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Solution

The correct option is B

1


If θ is the angle made by a line with the positive X-direction then the slope of the line is given by Tanθ.

Here, AC is parallel to X-axis. If a line makes an angle θ with AC then, the angle made by the line with X-axis is θ.

So, the slope of AB=Tan(45o)=1.


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