� For a pyramid of height h and base area A : 1 .
1
Ah : Volume
3
� For a circular cone of height h and radius r : 1 . 2 .
2 2 l � r � h : Slant height �r
3 . � rl
2
� �rl
: Total surface area : Curved surface area
1 2
4 .
3 � rh: Volume
� For a sphere of radius r : 1 .
2
4� r : Total surface area
4 3
2 .
3 � r : Volume
� For a hemisphere of radius r : 1 . 2 .
2
3� r : Total surface area
2
2� r : Curved surface area
2 3
3 . 3 � r : Volume
15
Complex Numbers
� Terminologies of complex numbers : i�
� 1: Imaginary unit z �a � bi : Complex number in Cartesian form a : Real part of z b : Imaginary part of z
* z �a � bi : Conjugate of z �a � bi
2 2 z � r � a � b : Modulus of z �a � bi
arg ( z) ��
� arctan b : Argument of z �a � bi a www . seprodstore . com
13