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June 27th, 2017, 11:13 AM  #1 
Newbie Joined: Jun 2017 From: Loughborough Posts: 5 Thanks: 0  Can Anyone find X on this paper? 
June 27th, 2017, 11:53 AM  #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, 03:50 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, 03:52 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, 04:10 PM  #5 
Math Team Joined: Jul 2011 From: Texas Posts: 2,756 Thanks: 1407 
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, 04:30 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, 04:55 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 05:09 PM. 
June 27th, 2017, 06:46 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:
 

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