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The angle between two lines can be worked out from their:

AColours
BEndpoints
CSlopes
DLengths
Answer & Solution
Correct answer: C. Slopes
1. Each line has an inclination fixed by its slope. 2. The angle between them follows from those two values. 3. So the angle is found from the slopes. _Source: syllabus Mathematics, Chapter 10, Straight Lines._
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