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# Finding Area of Triangle- A* Harder

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1. How can you tell when to use the '1/2 abSinC' rule, the Sine or the Cosine Rules?
2. 1/2 abSin(C) and cosine rule is for when you know two sides and the angle opposite the third side.
sine rule is for when you know two sides and an angle opposite one of those sides.
also, if you know all three sides you can use cosine rule to find any of the three angles
3. (Original post by shawn_o1)
1/2 abSin(C) and cosine rule is for when you know two sides and the angle opposite the third side.
sine rule is for when you know two sides and an angle opposite one of those sides.
also, if you know all three sides you can use cosine rule to find any of the three angles
Thank you so much

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