The angle between two lines is discussed in terms of their:
ASketches
BSlopes
CShapes
DShadows
Answer & Solution
Correct answer: B. Slopes
1. Each line carries a slope derived from its inclination.
2. Comparing the two slopes compares the two directions.
3. The angle between two lines is discussed in terms of their slopes.
4. Both lines must be non-vertical for that to work.
_Source: NCERT Class XI Mathematics, Ch 9 'Straight Lines'_
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