Question

Medal and Fan for anyone who can help with a few Pre calc questions :)

Answer 1

Im not sure that i have the correct answer here

Answer 2

Suppose a triangle has sides a, b, and c, and let be the angle opposite the side of length a. If cos < 0, what must be true?
(Points : 3)

Answer 3

I only know the answer for if cos>0

Answer 4

@paki could you please take a look im stumped

Answer 5

cos negative means it is an obtuse angle
so a^2>b^2+c^2

Answer 6

Alright gotcha.

Answer 7

but thats not then final answer is it?

Answer 8

??

Answer 9

Well the one i selected looks correct, but im not 100% sure on it, and this test is kinda important

Answer 10

But i get what you're saying its more than likely D.

Answer 11

@Catch.me

Answer 12

I gave you my reasoning.
If it is convincing then take it:P