
Trigonometry Trigonometry Math Forum 
 LinkBack  Thread Tools  Display Modes 
June 27th, 2017, 12:13 PM  #1 
Newbie Joined: Jun 2017 From: Loughborough Posts: 5 Thanks: 0  Can Anyone find X on this paper? 
June 27th, 2017, 12:53 PM  #2 
Senior Member Joined: Dec 2012 From: Hong Kong Posts: 853 Thanks: 311 Math Focus: Stochastic processes, statistical inference, data mining, computational linguistics 
The title says 'Using the cosine ratio to find the angle’s adjacent side', so my guess is that X is the adjacent.

June 27th, 2017, 04:50 PM  #3  
Newbie Joined: Jun 2017 From: Loughborough Posts: 5 Thanks: 0  Quote:
I can't see the benefit of calling adjacent/hypotenuse "a cosine" our giving a simple division a name at all Also don't see how/why you use the length of the adjacent to calculate the length of the adjacent??????? Is the whole question bogus?????  
June 27th, 2017, 04:52 PM  #4 
Newbie Joined: Jun 2017 From: Loughborough Posts: 5 Thanks: 0 
Anyone else manage to workout the length of the adjacent by using the hypotenuse and one angle?

June 27th, 2017, 05:10 PM  #5 
Math Team Joined: Jul 2011 From: Texas Posts: 2,781 Thanks: 1432 
the expression to find it is circled in red on the sheet ... the large X hilited in yellow is a multiplication symbol. the small x in the chart and in the instructions represents the length of the adjacent side 
June 27th, 2017, 05:30 PM  #6 
Newbie Joined: Jun 2017 From: Loughborough Posts: 5 Thanks: 0 
So I don't use cosine at all but a calculator or lookup table that converts the angle  Cos 10 = 0.83907152907 So length of the adjacent = Hypotenuse x 0.83907152907 
June 27th, 2017, 05:55 PM  #7 
Member Joined: Apr 2017 From: Canada Posts: 32 Thanks: 2 
cos(10) = a/20 a = 20*cos(10) which is approx. 19.7cm *for the first one Last edited by Antoniomathgini; June 27th, 2017 at 06:09 PM. 
June 27th, 2017, 07:46 PM  #8  
Senior Member Joined: Dec 2012 From: Hong Kong Posts: 853 Thanks: 311 Math Focus: Stochastic processes, statistical inference, data mining, computational linguistics  Quote:
 

Tags 
find, paper 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Printing paper  Yvan  Advanced Statistics  3  October 16th, 2013 11:53 AM 
Paper problem  Crouch  Number Theory  14  May 24th, 2012 01:05 AM 
Suggestions on paper  Deb_D  Advanced Statistics  3  November 23rd, 2010 10:07 AM 
Paper length  plsm  Applied Math  0  June 10th, 2009 07:02 PM 
the paper  bigli  Real Analysis  3  May 22nd, 2007 11:00 AM 