Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

It's been a long time since I've done trig, and I never new it very well. I have a problem I don't know how to solve.

I have an object on a 2D plane that I want to move. I have this objects x and y coordinates, I also have it's velocity, and the angle of the velocity in radians.

How can I take this information and calculate velocity long the X axis and Y axis. I.E., how can I convert the angle and velocity to the delta of X and Y?

share|cite|improve this question
Sounds like a case of using parametric equations. – Hawk Jun 29 '12 at 2:09
up vote 2 down vote accepted

$v_x = v\cdot \cos(\theta)$

$v_y = v\cdot \sin(\theta)$

share|cite|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.