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Determine the Value of X to the nearest tenth of a centimetre. 

Julius  May 3, 2017
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I'll assume the fourth vertex is labelled C.

 

1. Find BC using the cosine rule:  BC2 = 272 + 272 - 2*27*27*cos(70º)

 

2. Find x from the fact that sin(27º) = BC/x so that  x = BC/sin(27º)

 

I'll leave you to crunch the numbers.

Alan  May 3, 2017

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