## warpedkitten one year ago Solve Δ ABC with A = 70°, b = 30, and c = 51. a. a = 50.77, B = 33.23°, C = 76.77° b. a = 50.77, B = 34.68°, C = 75.32° c. a = 49.54, B = 33.23°, C = 76.77° d. a = 49.54, B = 34.68°, C = 75.32°

1. Nnesha

|dw:1433473181134:dw| use law of cosines to find 3rd side $\huge\rm a^2 = c^2 + b^2 -2b cos(A)$ plug in numbers solve for a

2. Nnesha

?Mhm im going 2 die in 2 minutes ;-;

3. warpedkitten

I've done that a few times and for some reason keep getting answers that don't even show up in the answers. I'm not sure exactly what I'm doing wrong.

4. Nnesha

alright i have one minutes let me check if i don't reply after 2 minutes thats mean i'm gone (internet issues####)

5. warpedkitten

$a^2 = 51^2 + 30^2 - 2*30*51cosA$ Right?

6. Nnesha

yes right <A is 70 so substitute 70

7. Nnesha

$\huge\rm a^2 = 51^2 + 30^2 - 2*30*51cos(70)$ now solve for a

8. Nnesha

u will get the right answer :-)

9. warpedkitten

Thank you! :)

10. warpedkitten

Would D be correct, then? @Nnesha