| Exam Board | OCR MEI |
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| Module | C4 (Core Mathematics 4) |
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| Year | 2006 |
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| Session | January |
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| Topic | Vectors 3D & Lines |
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3 A triangle ABC has vertices \(\mathrm { A } ( - 2,4,1 ) , \mathrm { B } ( 2,3,4 )\) and \(\mathrm { C } ( 4,8,3 )\). By calculating a suitable scalar product, show that angle ABC is a right angle. Hence calculate the area of the triangle.