(adsbygoogle = window.adsbygoogle || []).push({}); [SOLVED] triangle problem using vectors

Hi!

question: Two sides of a triangle are formed by vectors i - 4j-k and -2i - j+k. The area is ?

A=1/2bh so I know to multiply the two vectors as such 1/2(vector1 x vector2) But what do I substitute foe i, j and k? Its not given in the problem.

so far...

1/2(-2i^2-ij+ik+8ji+4j^2-4jk+2ki+kj-k^2)

so what do I substitute foe i, j and k?

Dx

**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!

# Triangle problem using vectors

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