We know that a.b = 0 is 90degrees, and a.b<0 is obtuse and a.b>0 is acute, but how do we prove this?? I can show it by plugging in values, but is there a formal way of showing this?
e.g. for this question (which isn't hard it's just how do we prove that a.b>0 is obtuse if we are asked to?)
@carrotsss I feel like you would know lol
e.g. for this question (which isn't hard it's just how do we prove that a.b>0 is obtuse if we are asked to?)
@carrotsss I feel like you would know lol