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4.01 Trigonometric ratios

Worksheet
Degrees, minutes and seconds
1

Convert the following angles to degrees, correct to two decimal places.

a
13 \degree 36' \ 35''
b
27 \degree 48' \ 12''
c
9 \degree 12' \ 40''
d
108 \degree 38'
2

Convert the following angles to degrees and minutes:

a
24.4 \degree
b
56.6392 \degree
c
125.61 \degree
d
287.312 \degree
3

Convert the following angles to degrees, minutes and seconds:

a
38.42 \degree
b
72.84 \degree
c
100.821 \degree
d
354.2671 \degree
4

Round the following as indicated:

a

62 \degree 19' to the nearest degree

b

43 \degree 50' to the nearest degree

c

41 \degree 34' \ 20'' to the nearest minute

d

25 \degree 49' \ 40'' to the nearest minute

Trigonometric ratios
5

Write down the indicated ratios for the following triangles:

a
i

\tan \theta

ii

\sin \alpha

b
i

\sin \theta

ii

\tan \alpha

c
i

\cos \theta

ii

\cos \alpha

d
i

\tan \theta

ii

\sin \alpha

e
i

\cos \theta

ii

\tan \alpha

f
i
\sin \theta
ii
\cos \alpha
6

In the following triangle \cos \theta = \dfrac{6}{10}.

a

Which angle is represented by \theta?

b

Find the value of \sin \theta.

c

Find the value of \tan \theta.

7

In the following triangle, \sin \theta = \dfrac{4}{5}:

a

Which angle is represented by \theta?

b

Find the value of \cos \theta.

c

Find the value of \tan \theta.

8

In the following triangle, \tan \theta = \dfrac{15}{8}.

a

Which angle is represented by \theta?

b

Find the value of \cos \theta.

c

Find the value of \sin \theta.

9

Consider the following triangle:

a

Find the value of \dfrac{\sin \theta}{\cos \theta}.

b

Find the value of \tan \theta.

c

What do you notice?

10

Consider the following triangle:

a

Find the length of AC.

b

Find the value of \tan \theta.

11

Consider the following triangle:

a

Find the value of x.

b

Find the value of \sin \theta.

c

Find the value of \cos \theta.

12

Consider the following triangle:

a

Find the value of x.

b

Hence, find the value of \tan \theta.

13

Given \tan \theta = \dfrac{7}{3}, calculate the exact value of \sin \theta.

14

Given the following triangle, calculate the exact value of \tan \theta.

Unknown sides
15

Find the value of f in the following triangles, correct to two decimal places:

a
b
16

Find the value of g in the following triangle, correct to two decimal places:

17

Determine the length of AC, correct to two decimal places.

18

Find the value of the pronumeral in the following triangles, correct to two decimal places:

a
b
c
d
Unknown angles
19

Find the value of x, to the nearest degree:

20

Find the value of \theta, to the nearest minute:

21

Find angle \theta in the following triangles to the nearest minute:

a
b
c
d
22

Consider the following diagram:

a

Find the value of x, correct to two decimal places.

b

Find the value of x, correct to the nearest minute.

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Outcomes

MA11-1

uses algebraic and graphical techniques to solve, and where appropriate, compare alternative solutions to problems

MA11-3

uses the concepts and techniques of trigonometry in the solution of equations and problems involving geometric shapes

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