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Specialist Maths — Question 11

QCAA 2021, Paper 2 · 4 marks

Q11 · 2021 · Technology-activeSimple familiar4 marks

QUESTION 11 (4 marks)

OABC is a triangular-based pyramid, as shown. The vertices are A(1,2,5)(1,2,5), B(−1,2,−2)(-1,2,-2) and C(0,5,2)(0,5,2). Use a vector method to determine the area of the shaded face ABC.
Triangular-based pyramid OABC with shaded face ABC
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