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NCERT Textbook
STRAIGHT LINES

Class 11
Maths :-NCERT Solutions - Straight Lines.

Page No 228:
Question 9:
Find angles between the lines 

Answer:


The given lines area.

The slope of line (1) is, while the slope of line (2) is.
The acute angle i.e., θ between the two lines is given by

Thus, the angle between the given lines is either 30° or 180° – 30° = 150°.


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NCERT Maths Class 11

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