Question

I really need help understanding when/ what situations to use sine rule and cosine rule with triangles, plssss.

thank you :)))​

Answer 1

See below :)

Explanation:

If you want a missing angle or side in one pair, and you have at least one side and angle pair, use the sine rule.

If you want a remaining side, and you have the other two sides and the angle opposite the unknown side, use the cosine rule.

If you want an angle, and you have all three sides, use the cosine rule rearranged for angles.

I attached a picture to help explain better :)