15.2.1 Trigonometry, PT3 Focus Practice
Question 1:
Diagram below shows a right-angled triangle ABC.
![](http://pt3mathematics.blog.onlinetuition.com.my/wp-content/uploads/sites/6/2017/07/Picture77-2-300x188.png)
It is given that AB
, calculate the length, in cm, of .
Solution:
Question 2:
In the diagram, PQR and QTS are straight lines.
![](http://pt3mathematics.blog.onlinetuition.com.my/wp-content/uploads/sites/6/2017/07/Picture78-2.png)
![](http://pt3mathematics.blog.onlinetuition.com.my/wp-content/uploads/sites/6/2017/07/Picture78-2.png)
It is given that
, calculate the length, in cm, of RS.
Solution:
Question 3:
In the diagram, PQR is a straight line.
![](http://pt3mathematics.blog.onlinetuition.com.my/wp-content/uploads/sites/6/2017/07/Picture79-2.png)
It is given that
yo , hence sin =
Solution:
Question 4:
Diagram below consists of two right-angled triangles.
![](http://pt3mathematics.blog.onlinetuition.com.my/wp-content/uploads/sites/6/2017/07/Picture80-2.png)
Determine the value of cos xo.
Solution:
Question 5:
Diagram below consists of two right-angled triangles ABE and DBC.
ABC and EBD are straight lines.
![](http://pt3mathematics.blog.onlinetuition.com.my/wp-content/uploads/sites/6/2017/07/Picture81-2.png)
![](http://pt3mathematics.blog.onlinetuition.com.my/wp-content/uploads/sites/6/2017/07/Picture81-2.png)
It is given that
(a) Find the value of tan xo.
(b) Calculate the length, in cm, of ABC.
Solution:
(a)
(b)