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 < ___°

Answer 1

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

Answer 2

yes it does

Answer 3

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

Answer 4

lol

Answer 5

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

Answer 6

right angle ?

Answer 7

1,1
0,1
----
0+1 = 1

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

Answer 8

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

Answer 9

ohhhhhh wow thank you i appreciate it :)

Answer 10

when in doubt, do simple checks :) good luck

Answer 11

ok i will :) thanks