Paper 2 · Co-ordinate Geometry of the Line
⏱ Tested in 5 exam questions since 2017
Lesson 6 of 9
The line 6: Angle between two lines
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- Find the angle between two lines with tan θ = ±(m₁ − m₂)/(1 + m₁m₂)
- Read slopes from y = mx + c form — rearrange general-form lines first
- Find the acute angle, then take 180° − θ for the obtuse angle
- Keep both ± cases to find the two slopes that make a given angle with a line
Most recent exam questions
- 2025 P2 Q1(a)(ii) — deferred
- 2025 P2 Q1(b)
- 2022 P2 Q2(c)
- 2020 P2 Q1(b)
- 2017 P2 Q4(b)
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