## anonymous 4 years ago if v1=(2,5) and v2=(4,-3) then the angle between the two vectors is_____. round the answer to two deciaml places

1. Hero

|dw:1328233416114:dw|

2. Hero

|dw:1328233602643:dw|

3. amistre64

$cos(t)=\frac{v1.v2}{|v1||v2|}$

4. amistre64

even tho the tangent thing would work as well :)

5. Hero

105.07

6. amistre64

cos(t) = -7/5sqrt(29) t = arccos(-7/5sqrt(29))

7. amistre64

105 degrees or so is good

8. Hero

Yeah, I'll just stick with tangent. I suppose your way is faster, but I don't know.....

9. amistre64

its easier when the angles arent split on the x axis :)

10. amistre64

otherwise that tangent is just as suitable

11. Hero

I suppose.

12. Hero

I doubt it though. I'd still figure out a way to use tangent discreetly