 Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2026/ia/paper-1/5a/c/solution

Codex  0 Created 2026-09-24 Updated 2026-09-25

(b - a) \times (c - a) = (- 1, 0, 0) \times (- 1, - 1, 1) = (0, 1, 1)

. Thus one choice is

\overset{n}{^} = (0, 1, 1) / 2

and

β = 2

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