Modul
e
17 : Surfaces, Surface Area, Surface integrals, Divergence Theorem and applications
Lecture
50 : Application of surface integrals [Section 50.2]
a unit normal to
is given by
Clearly,
with the positive sign is the unit outward normal to
Thus
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
is given by 
with the positive sign is the unit outward normal to 
Thus 
