02 Vectors not done very shitty Flashcards
1
Q
Unit vector
A
2
Q
Ratio theorem
A
3
Q
Dot product a.b
A
a ∙ b = |a| |b| cos θ
4
Q
cross product a x b
A
a x b = |a| |b| sin θ n
5
Q
vectors are prependicular
A
a.b=0
6
Q
length of projection
A
a.b / b
7
Q
parallel vectors
A
a x b = 0
8
Q
area of triangle
A
1/2 | a x b|
9
Q
Vector straight line 3 types of eqns
A
10
Q
Vector eqns of planes
A
11
Q
Angle between 2 planes
A
cos theta = |n . n| / |n| |n|
basically dot prod but use normals of both planes
