Question 4:
Diagram below shows three vertical poles JP, KN and LM, on a horizontal plane.
![](http://spmmathematics.blog.onlinetuition.com.my/wp-content/uploads/sites/5/2015/03/Picture17.png)
![](http://spmmathematics.blog.onlinetuition.com.my/wp-content/uploads/sites/5/2015/03/Picture17.png)
The angle of elevation of N from P is 15o.
The angle of depression of M from N is 35o.
Calculate the distance, in m, from K to L.
Solution:
![](http://spmmathematics.blog.onlinetuition.com.my/wp-content/uploads/sites/5/2015/03/Picture18.png)
![](http://spmmathematics.blog.onlinetuition.com.my/wp-content/uploads/sites/5/2015/03/Picture18.png)
Question 5:
Diagram below shows two vertical poles JM and LN, on a horizontal plane.
![](http://spmmathematics.blog.onlinetuition.com.my/wp-content/uploads/sites/5/2015/03/Picture19.png)
![](http://spmmathematics.blog.onlinetuition.com.my/wp-content/uploads/sites/5/2015/03/Picture19.png)
The angle of elevation of M from K is 70oand the angle of depression of K from N is 40o.
Find the difference in distance, in m, between JK and KL.
Solution:
![](http://spmmathematics.blog.onlinetuition.com.my/wp-content/uploads/sites/5/2015/03/Picture20.png)
![](http://spmmathematics.blog.onlinetuition.com.my/wp-content/uploads/sites/5/2015/03/Picture20.png)