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3.5 Trigonometry (A-level only)

3.5 Trigonometry (A-level only)

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Question 34

Figure 1 below shows the sector AOB AOB\,AOB of a circle.

Figure for question 5

A student's attempt to find the area of the sector AOB AOB\,AOB is shown below.

Area =12r2θ=12×62×40=720\displaystyle = \frac{1}{2}r^2\theta = \frac{1}{2} \times 6^2 \times 40 = 720=21​r2θ=21​×62×40=720 cm2^22

a.

Identify the mistake made by the student.

[1]
b.

Write out a correct solution.

[2]
Markscheme

3.5 Trigonometry (A-level only) Questions

  1. A Level
  2. /Maths
  3. /3.5 Trigonometry (A-level only)

225 exam-style questions on WJEC A Level Maths 3.5 Trigonometry (A-level only), covering 3.5.1 Trigonometry (A-level only), 3.5.2 Trigonometry (A-level only), 3.5.3 Trigonometry (A-level only), 3.5.4 Trigonometry (A-level only), 3.5.5 Trigonometry (A-level only), 3.5.6 Trigonometry (A-level only), 3.5.7 Trigonometry (A-level only), and 3.5.8 Trigonometry (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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