Winkel berechnen:
a
=
cos
-
1
(
a
⋅
b
|
a
|
⋅
|
b
|
)
Skalarprodukt:
|
a
|
⋅
|
b
|
=
(
a
1
b
1
+
a
2
b
2
+
a
3
b
3
)
Vektorprodukt:
|
a
⨯
b
|
=
(
a
2
b
3
-
a
3
b
2
a
3
b
1
-
a
1
b
3
a
1
b
2
-
a
2
b
1
)