i have a vector ai+bj+ck(adsbygoogle = window.adsbygoogle || []).push({});

is the resultant equal to sqrt(a^2+b^2+c^2). if so how do i explain it mathematically?

i know the resultant of a 2d vector is equal to sqrt(a^2+b^2) and it can be proved from pythagoras theorem? any ideas??

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: How to find the resultant of 3d vector?

**Physics Forums | Science Articles, Homework Help, Discussion**