Question

Suppose a triangle has side length a, b, and c. and let theta be the angle opposite of b, if cos theta >0 what must be true?

Answer 1

jim_thompson5910 can you help?

Answer 2

@jim_thompson5910

Answer 3

cos theta = 0 at 90 degrees ----> right angle

cos theta < 0 when theta > 90 degrees ----> obtuse angle

cos theta > 0 when theta < 90 degrees ----> acute angle

Answer 4

Alright I am still stuck

Answer 5

do you have a unit circle? do you understand how the cosine function works?

Answer 6

yes and yes

Answer 7

@dumbcow