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September 21st, 2007, 07:30 AM  #1 
Member Joined: Aug 2007 Posts: 39 Thanks: 0  Solving problems using the sine and cosine rules
in my maths textbook, there is this problem i can't work out: Adjacent sides of a parallel are 6cm and 8.3cm. The shorter diagonal is 7cm. work out the length of the other diagonal. your meant to use either the cosine or sine rules, or both together, but without a given angle, i don't know how to work it out. could you expalin how to get to the answer please ?? 
September 21st, 2007, 07:52 AM  #2 
Member Joined: Aug 2007 Posts: 39 Thanks: 0 
actually its allright, i realized what i did wrong, i just need to draw my diagrams better 

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