Finding the direction of a vector in radians from the positive x-axis

[cbs81]

vector b = (89.9)x + (-43.8)y

what is the direction of b in radians counter clockwise from the positive x - axis.

i already solved for the unknown side, but i don't understand how i solve this with the information given? any help would greatly appreciated.

 

[cbs81]

sorry mods, please move to coursework help.

 

[Feldoh]

Setup a trig ratio to find the angle in radians...

 

[cbs81]

so, do i do:

360 * tan ^-1 (43.8/89.9)

i'm not sure what do about counter clockwise thanks.

 

[mezarashi]

The counter-clockwise means that if the angle opens below the positive x-axis, then it is considered positive.