Title All Trig Revision Qus Sine Trigonometric Functions Triangle Euclidean Plane Geometry 111.6 KB 11
##### Document Text Contents
Page 1

IB Questionbank Maths SL 1

Trig – whole topic revision questions JWC 2014

1. The following diagram shows a circle with radius r and centre O. The points A, B and C are on the circle
and CÔA =.

The area of sector OABC is
3

4
 and the length of arc ABC is

3

2
.

Find the value of r and of .
(Total 6 marks)

2. The diagram shows the graph of the function f given by

f (x) = A sin 



 x

2
 + B,

for 0  x  5, where A and B are constants, and x is measured in radians.

0 1 2 3 4 5

2

y

x

(0, 1)

(1,3)

(3, –1)

(5, 3)

The graph includes the points (1, 3) and (5, 3), which are maximum points of the graph.

(a) Write down the values of f (1) and f (5).
(2)

(b) Show that the period of f is 4.
(2)

Page 2

IB Questionbank Maths SL 2

The point (3, –1) is a minimum point of the graph.

(c) Show that A = 2, and find the value of B.
(5)

(d) Show that f (x) = cos x
2

.

(4)

The line y = k – x is a tangent line to the graph for 0 x 5.

(e) Find

(i) the point where this tangent meets the curve;

(ii) the value of k.
(6)

(f) Solve the equation f (x) = 2 for 0 x 5.
(5)

(Total 24 marks)

3. If A is an obtuse angle in a triangle and sin A =
13
5 , calculate the exact value of sin 2A.

Working:

......................................................................

(Total 4 marks)

Page 5

IB Questionbank Maths SL 5

The sketch below shows the depth y, of water, at time t, during one day (24 hours).

15
14
13
12
11
10
9
8
7
6
5
4
3
2
1

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
time (hours)

depth (metres)

t

y

(b) (i) Write down the maximum depth of water in the harbour.

(ii) Calculate the value of t when the water is first at its maximum depth during the day.
(3)

The harbour gates are closed when the depth of the water is less than seven metres. An alarm rings when
the gates are opened or closed.

(c) (i) How many times does the alarm sound during the day?

(ii) Find the value of t when the alarm sounds first.

(iii) Use the graph to find the length of time during the day when the harbour gates are closed.

(7)
(Total 13 marks)

Page 6

IB Questionbank Maths SL 6

8. The following diagram shows a triangle with sides 5 cm, 7 cm, 8 cm.

5 7

8

Diagram not to scale

Find

(a) the size of the smallest angle, in degrees;

(b) the area of the triangle.

Working:

(a) ..................................................................

(b) ..................................................................

(Total 4 marks)

9. Let f (x) = sin 2x and g (x) = sin (0.5x).

(a) Write down

(i) the minimum value of the function f ;

(ii) the period of the function g.

(b) Consider the equation f (x) = g (x).

Find the number of solutions to this equation, for 0 x
2

π3
.

Page 10

IB Questionbank Maths SL 10

Working:

(a) ..................................................................

(b) (i) ...........................................................

(ii) ...........................................................

(Total 6 marks)

14. The diagram shows a circle of radius 5 cm.

Find the perimeter of the shaded region.

Working:

......................................................................

(Total 4 marks)

Page 11

IB Questionbank Maths SL 11

15. The depth, y metres, of sea water in a bay t hours after midnight may be represented by the function

t
k

bay
2

cos , where a, b and k are constants.

The water is at a maximum depth of 14.3 m at midnight and noon, and is at a minimum depth of 10.3 m
at 06:00 and at 18:00.

Write down the value of

(a) a;

(b) b;

(c) k.

Working: