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#### Petrus

##### Well-known member

- Feb 21, 2013

- 739

Decide the angle between line \(\displaystyle x+2y-3=0\) and \(\displaystyle -3x+y+1=0\) we use ON-cordinate

progress

I know that their normalvector is \(\displaystyle (1,2)\) and \(\displaystyle (-3,1)\) but what shall I do next?

Is this correctly understand

Regards,

\(\displaystyle |\pi\rangle\)

progress

I know that their normalvector is \(\displaystyle (1,2)\) and \(\displaystyle (-3,1)\) but what shall I do next?

Is this correctly understand

Regards,

\(\displaystyle |\pi\rangle\)

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