Question

Solve the triangle using either the Law of Sines or the Law of Cosines. Round your answer to the nearest tenth. A = 23°, B = 55°, b = 9

Answer 1

Looks like a good candidate for Law of Sines.

Answer 2

k..

Answer 3

..?

Answer 4

A good way to know is to draw the triangle. If you have two sides and the angle between them, then L.O.C. is the best start, if you see a side opposite an angle, then start with L.O.S.

Answer 5

Also, whenever you have two angles given, you can immediately find the third angle using interior angle theorem.

Answer 6

@coolaidd Can you find law of Sin and write here for me?

Answer 7

im not sure how to do that

Answer 8

(length of side a / sin of A) + (length of side b / sin of B)

Answer 9

Also note, your triangle is going to add up to 180 degrees. So you already know the angle of C by taking 180 - A - B. Then you have three angles and the length of 1 side.

Answer 10

@coolaidd I ask you to write down just the FORMULA, nothing else!

Answer 11

@coolaidd , if you're having trouble remembering the formula, you can find it on this cheat sheet here: http://tutorial.math.lamar.edu/pdf/Trig_Cheat_Sheet.pdf

Answer 12

23/9?

Answer 13

^ ?

Answer 14

@coolaidd You win, I give up !!!

Answer 15

please help

Answer 16

Step one: draw and label the triangle.
Step two: find the third angle.
Step three: write down the law of cosines and law of sines formulas.
Step four: use the law of sines formula first by filling in your given information.

Let me know what you get after that, and we'll go from there.