Petrus
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Decide the angle between line $$x+2y-3=0$$ and $$-3x+y+1=0$$ we use ON-cordinate
progress
I know that their normalvector is $$(1,2)$$ and $$(-3,1)$$ but what shall I do next?
Is this correctly understand
Regards,
$$|\pi\rangle$$
progress
I know that their normalvector is $$(1,2)$$ and $$(-3,1)$$ but what shall I do next?
Is this correctly understand

Regards,
$$|\pi\rangle$$
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