The line l₁ has equation r = i+3j-k+λ(i−j−4k). The plane Π contains l₁ and is parallel to the vector 2i+5j-4k. The line l₂ is parallel to the vector 5i – 5j – 2k.
- (a)Find the equation of Π, giving your answer in the form ax+by+cz = d.[4]
- (b)Find the acute angle between l₂ and Π.[3]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2024). The mark or mark type is shown in brackets.
- [M1 A1] Finds vector perpendicular to the plane.
- [M1 A1] Uses point in the plane.
- [M1A1FT] Uses dot product of 5i-5j-2k and their normal.
- [A1] 0.744 radians
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