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Date May 2018 Marks available 3 Reference code 18M.2.SL.TZ1.S_3
Level Standard Level Paper Paper 2 Time zone Time zone 1
Command term Find Question number S_3 Adapted from N/A

Question

The diagram shows a circle, centre O, with radius 4 cm. Points A and B lie on the circumference of the circle and AÔB = θ , where 0 ≤ θπ.

Find the area of the shaded region, in terms of θ.

[3]
a.

The area of the shaded region is 12 cm2. Find the value of θ.

[3]
b.

Markscheme

* This question is from an exam for a previous syllabus, and may contain minor differences in marking or structure.

valid approach to find area of segment      (M1)

eg  area of sector – area of triangle, 12r2(θsinθ)

correct substitution      (A1)

eg  14(4)2θ12(4)2sinθ,12×16[θsinθ]

area = 80 – 8 sinθ, 8(θ – sinθ)     A1 N2

[3 marks]

a.

setting their area expression equal to 12      (M1)

eg  12 = 8(θ – sinθ)    

2.26717

θ = 2.27 (do not accept an answer in degrees)      A2 N3

[3 marks]

b.

Examiners report

[N/A]
a.
[N/A]
b.

Syllabus sections

Topic 3— Geometry and trigonometry » SL 3.4—Circle: radians, arcs, sectors
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Topic 3— Geometry and trigonometry » SL 3.8—Solving trig equations
Topic 3— Geometry and trigonometry

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