Everything Maths Grade 10

13.In the following triangle find the size ofABC^.

41 ◦

9

A

D C B

17

14.In the following triangle find the length of sideCD:

A

D C B

35 ◦

15 ◦

9

15.In the following triangle determine:

1 6

:



3

8

a) the length ofEF b)tan(90◦) c) the value of

16.Given thatD^=x;C^ 1 = 2x; BC=12,2 cm; AB=24,6 cm. CalculateCD.

B

A

C

1 2

1 2

D

17.Solve forifis a positive, acute angle:

a) 2 sin=1,34 b) 1 tan= 1 c) cos 2 =sin 40 °

d)sec=1,8 e)cot 4 =sin 40 ° f) sin 3 + 5 = 4

g) cos(4 +) =0,45 h)

sin

cos

= 1

Chapter 5. Trigonometry 143