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Long answer·Hard exam skill (4/5)·No calculatorNeeds mentor review

Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Question

Find the area of triangle ABCABC where A(1,0,0), B(0,1,0), C(0,0,1).A(1,0,0),\ B(0,1,0),\ C(0,0,1).
Total: 4 marks

(a) Find AB→\overrightarrow{AB} and AC→\overrightarrow{AC}. (1 mark)

(b) Find AB→×AC→\overrightarrow{AB}\times\overrightarrow{AC}. (2 marks)

(c) Find the area of triangle ABCABC. (1 mark)

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cbse-math-12.u4.t4-4.laq.004

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