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December 3rd, 2017, 01:17 PM  #1 
Newbie Joined: Dec 2017 From: Manchester Posts: 1 Thanks: 0  Sine and Cosine to find area of surface Untitledddd.png I am struggling with this one, finding the area of the land via the sine or cosine rule. I just don't see how I can go about it, I know I could use the formula for the area of a nonright angled triangle if I split it from B to D and make two triangles (½ ab sin C) However, I don't see how I can use the sine rule and apply it. Any assistance would be appreciated. The question really wants me to use Sine and cosine. 
December 3rd, 2017, 01:30 PM  #2 
Math Team Joined: Jul 2011 From: Texas Posts: 2,761 Thanks: 1416 
Use $Area=\dfrac{1}{2}ab\sin{C}$ for both triangles, then sum.


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area, cosine, find, sine, surface 
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