Edexcel Mathematics October 2021 · Paper 1 · Question 6 · ExamRizz

ExamRizzEdexcel MathematicsMathematics

October 2021 · Paper 1 · Question 6 · 5 marks

6. BC A Figure 1 Figure 1 shows a sketch of triangle ABC. Given that • AB→ = −3 i − 4 j − 5 k • BC→ = i + j + 4 k (a) find AC→ (2) (b) show that cos ABC = 9 10 (3) 15 16 17

Lesson: Vectors in 2D and 3D