How do i find the horizontal component of a vector? Precalculus Vectors in the Plane Vector Operations 1 Answer Trevor Ryan. Sep 24, 2015 #A_x=|vecA|costheta * hat i# Explanation: Any vector #vecA# of magnitude #|vecA|# and acting at an angle #theta# to the horizontal or the positive x-axis, has a horizontal component given by #A_x=|vecA|costheta * hat i#, where #hat i# is a unit vector along the positive x-axis. Answer link Related questions Question #b4ef9 What is meant by a component of a vector? How do I find the vertical component of a vector? Is vector addition commutative? What happens when I multiply a vector by itself? What is the definition of vector addition? How do I do vector subtraction? What is a velocity vector? How can the law of cosines be used to find the magnitude of a resultant? Can the sum of three vectors be zero? See all questions in Vector Operations Impact of this question 4256 views around the world You can reuse this answer Creative Commons License