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Finding Area of Triangle- A* Harder

How can you tell when to use the '1/2 abSinC' rule, the Sine or the Cosine Rules?
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
(edited 7 years ago)
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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