For what values of the angle θ between the two vectors is their scalar product positive?

___ ° ≤ θ

Question

For what values of the angle θ between the two vectors is their scalar product positive?

___ ° ≤ θ < ___°

For what values of θ is their scalar product negative?

 ___° < θ < ___°

amistre64 · Answer

scalar product seems like a seldom used term.  does this go by other names?  dot product perhaps?

anonymous · Answer

yes it does

amistre64 · Answer

good, i thought i was going insane for a moment :)

anonymous · Answer

lol

amistre64 · Answer

lets test this out, dot 1,1 with 0,1 ; its a 45 degree angle between them, what do we get?

anonymous · Answer

right angle ?

amistre64 · Answer

|dw:1348780711881:dw|

amistre64 · Answer

1,1
0,1
----
0+1 = 1

so, 0 to 90 will give us positive results; which means that 90 to 180 give negatives

amistre64 · Answer

.... <1,0> , either way :)

anonymous · Answer

ohhhhhh wow thank you i appreciate it :)

amistre64 · Answer

when in doubt, do simple checks :)  good luck

anonymous · Answer

ok i will :) thanks