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 December 3rd, 2017, 02:17 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 non-right 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, 02:30 PM #2 Math Team   Joined: Jul 2011 From: Texas Posts: 2,805 Thanks: 1449 Use $Area=\dfrac{1}{2}ab\sin{C}$ for both triangles, then sum. Thanks from greg1313

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